air pressure experiment with balloon and bottle

Balloon in a Bottle

Activity length, states of matter, activity type, discrepant event (investigatable).

Blowing up a balloon involves forcing additional air particles from your lungs into the balloon. These particles hit the inside walls of the balloon creating enough air pressure to force the rubber of the balloon to expand and the balloon to inflate.

The collision of these air particles with the walls creates a high-pressure environment inside the balloon relative to the atmospheric pressure around it. This is why when a balloon is released, the high-pressure air flows out of the balloon to the low-pressure air surrounding it: "Winds blow from high to low."

When a balloon is placed inside the bottle, it will not inflate, since the bottle is already filled with air particles with no escape route. This is a great demonstration that air takes up space. The air inside the bottle compresses a little bit but not enough to permit the balloon to inflate.

When you punch a hole in a bottle, the air molecules in the bottle have an exit. They are pushed out as a balloon fills the space inside, resulting in room for the balloon to inflate.

If the hole in the bottle is then plugged, the balloon stays inflated even when the mouth is removed. This is because the high pressure air in the balloon pushes outward harder than the low pressure air in the bottle. The air in the balloon pushes out against the walls, keeping it inflated. When the hole is unplugged, air flows back into the bottle. The air pressure in the bottle increases and collapses the balloon.

An alternate demo using a glass bottle and a straw "air exit tunnel" can be seen here .

Explain how air pressure works.

Per Demo or Class: 2 Plastic drink bottles (2 litres in size, clean and dry) 2 balloons scissors, thumbtack, or nail (for leader to make the hole)

Key Questions

• Why did one balloon inflate and the other not? If there is no change in air pressure, the balloon will not deflate (or inflate further)
• Why does air take up space?
• Why is it impossible to inflate a balloon inside a bottle?
• What is meant by atmospheric pressure?
• ​Before the class arrives, make a hole in the bottom of one of the bottles, 2–5 milimetres across, using the scissors, thumbtack, or nail.
• Select two volunteers, preferably one small student and one big student.
• Give the bigger student the bottle without a hole and give the smaller student the bottle with the hole.

• On the count of three, challenge the volunteers to blow up their balloons!
• Only the smaller student’s balloon should inflate (in the bottle with the hole in the bottom).
• Thank the students and ask another pair of students to come up and repeat the demonstration (use new balloons).

​Teacher Tip:  Kids have small lungs! The activity may be better suited as a competition between two adults.

• Inflate the balloon in the bottle again and cover the nail hole with your finger. Pour water into the balloon while keeping your finger over the hole.
• Go outside or hold the bottle over a sink before you remove your finger. Watch out for that stream of water gushing out of the bottle top!

Other Resources

Science World Bonus | Balloon in a Bottle (Stage Show Version)

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In these activities students explore the impressive force of air and learn how air pressure affects their daily lives., in the activities that follow, students explore balloon properties and their use in demonstrating various scientific concepts. list of activities…, weather is an important part of our lives and one that we cannot control. instead, it often controls how and where…, related school offerings.

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Balloon and Jar Air Pressure Experiment

by Science Explorers | Mar 29, 2021 | Blog | 0 comments

Air pressure experiments for children are a fun way to introduce kids to a new scientific concept. Kids and adults alike have a blast with this balloon and jar air pressure experiment. The experiment shows children what happens when the air pressure inside a jar changes by using just a few materials. It’s the perfect lesson for elementary school-age children with adult supervision.

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What You’ll Need

To perform the experiment, you’ll need:

• Water balloon.
• Piece of paper.

Safety Note

This experiment uses fire. Children must be supervised and should not perform the experiment on their own.

How to Conduct the Experiment

Follow these instructions to suck a water balloon into a jar using air pressure:

• Fill the balloon:   Fill the water balloon until it’s slightly wider than the neck of the jar and tie the balloon.
• Place the balloon on the jar:   Place the jar on a flat surface and rest the balloon on top of the open jar.
• Demonstrate with the water balloon:   Help the kids push down slightly on the balloon to show them it won’t fit inside the jar.
• Remove balloon:   After demonstrating, remove the balloon from the container.
• Get your matches:   Light a piece of paper with a match and drop it in the jar.
• Place the balloon again:   When the fire starts to grow, place the balloon back over the mouth of the jar.
• Watch the reactions:   Observe what happens to the balloon and the fire. The balloon will begin to shake, and the fire will be extinguished as the balloon is sucked into the jar. The balloon will be sucked about halfway into the container.
• Let the kids try:   Once the fire has died and the jar has cooled, have the children try to remove the balloon. It will be a little challenging!
• Safely remove the balloon:   To remove the water balloon from the jar, start by turning the jar sideways. Place your finger between the container and the balloon to release the suction. The balloon should come out easily after that.

Children will love doing this experiment over and over. To make this air pressure experiment even more fun for kids, let each child pick a balloon to decorate before you fill it with water. This allows children to observe any differences between how the balloons behave, such as which balloon was most difficult to remove and which one worked best.

The Science Behind the Experiment

This experiment is all about air pressure. When you first place the filled balloon atop the jar, air pressure prevents you from pushing it inside. The air trapped inside the jar has nowhere to go, since the balloon covers the opening. At this point, the air pressure within the jar is the same as the air pressure outside it, making it impossible to fit the balloon in.

But when you add the lit piece of paper to the jar, things change. The burning paper causes the air inside the jar to heat up and expand. As the fire grows, the air in the jar will start escaping around the sides of the balloon. When the balloon begins shaking that’s how you know the air is escaping.

The balloon acts as a one-way valve, allowing air within the jar to escape but preventing new air from entering. With less air in the jar, the air pressure drops. At this point, the air pressure within the jar is lower than outside it, which causes the balloon to get sucked in.

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How to do an Air Pressure on Water Experiment for Kids

• September 26, 2021
• 5-6 Year Olds , 7-9 Year Olds , Physics

Have you ever wondered how water can be pulled up into a straw? Or what happens to the air pressure when you go up in an airplane?

Now, you can explore these questions with this awesome experiment. The science behind this phenomenon is air pressure.

If you have ever had a bike pump, then you know that the higher the pressure inside, the more forcefully it can push air out . This same principle also applies to water being sucked up through your water dispenser.

Air Pressure and Water Experiment Supplies

Air Pressure on Water Experiment is an awesome physical science experiment as it can be done using simple and easily available supplies. Here is the list of items you need to collect before you start the experiment.

1) A Balloon

2) A Plastic straw

4) A small container (glass one is better to get a good visual experience) or a Peg

5) Putty or Plasticine

6) A Plastic water bottle (Make sure it is clean and clear no matter the shape and size.)

7) Food Color

8) Some other miscellaneous things like kids-friendly knife, glue, metal scale, etc.

Directions to do Air Pressure on Water Experiment

Step-1: Select a place where you feel free to do experiments with water like sinks or outdoors as this activity messy up things with water.

Step-2: Now, pick an old and clear plastic bottle and make a hole of 10cm at the middle of the bottle. You can use kid-friendly knife or scissors to make hole. Whatever the tool you use, make sure you are moving it clock and anti-clock wise direction to achieve a good round shape. You can also use a soldering rod to make exact size hole as of straw.

Step-3: Once the hole is ready, insert the plastic straw into it and seal any leakages around the hole using hot glue. You can also use putty or plasticine to seal it.

Step-4: Then, take a small container and add some amount of water. Also add a few drops of food color and into the water to make it colourful. This colourful water is good to experiment with as it gives good visual experience of the experiment.

Step-5: As a next step, pour the color water into the plastic bottle fixed with straw up to half way. And keep a peg or small glass or transparent container under the other end of the straw which is hanging outside of the bottle.  

Step-6: In this step, take a medium sized balloon and inflate it using your mouth or any balloon blower machine. Seal the mouth of the inflated balloon and fit it around the mouth of the bottle carefully. At this point, our school science fair project set up to show Air Pressure is ready for demo.

Step-7: Now, release the secured mouth part of inflated balloon such that the air inside it goes straight down into the plastic bottle.

Step-8: You will notice the color water inside the plastic bottle moving out of the straw towards the small container placed beside the plastic bottle under the open end of straw.

What is the science behind the water movement in this experiment?

In this physical science project, the air gives pressure equally on the water and inside straw when there is no balloon around the mouth of the plastic bottle.

But when the inflated balloon is set up on top of the plastic bottle i.e. around its mouth part, the air inside the balloon forces down into it.

Thus, creates increased pressure on the surface of the water and presses the water molecules down due to force and gravity. This increased pressure inside the water pushes water into the straw. And hence the water moves towards the straw and stores in the small container placed outside.

The science concepts learned through this classic Air Pressure Experiment on Water include:

1) Atmospheric Pressure: The pressure applied by the molecules (that has weight) present in the atmosphere or air towards the surface of the Earth due to the force and gravity is known as Atmospheric Pressure. Atmospheric Pressure is also known as Barometric Pressure.

2) Pressure: The amount of force exerted per unit area byt the surrounding surfaces and particles is known as pressure. The pressure unit is pascal. The formula of pressure is P=F/A. Absolute pressure, atmospheric pressure are the types of pressure.

3) Potential Energy: The energy developed due to the pressure or force with in itself is known as potential energy. Potential energy can also use electric charges to build its energy.

In this experiment, the air inside the inflated balloon develops potential energy and tries to come out of it. And hence, the water feels pressure when the mouth of the inflated balloon releases.

This pressure makes the water flow out of the plastic bottle and into the small container placed beside it through the straw.

Other Air Pressure Experiments You Can Try at Home

Balloon and Pin Experiment

Egg in a Bottle – Air Pressure Experiment

Balloon in a Bottle : Air Pressure Experime nt

Drip Drop Bottle-Water Bottle Pressure Experiment

What we learn from Air Pressure on Water Experiment

• Students learn about Air and Atmospheric pressure
• Explore different types of forces, pressures, and potential energy
• Get knowledge on various science terms such as atmospheric pressure, force, pressure, stress, etc.
• Can be a great science fair idea
• Encourages children to actively participate in science work-shops and events

How do you define Air Pressure?

Air pressure is the pressure created by the weight of the particles in the air that are forcing to move down to Earth because of gravity.

In simple words, air around us encompasses of a lot of air molecules (that has weight), which exerts pressure whenever they get in touch of any objects. This is the pressure we call it as Air Pressure.

Air pressure is also known as Atmospheric Pressure. As we use Barometer to generally measure atmospheric pressure, we also call it as Barometric Pressure.

The standard unit of atmospheric pressure is equivalent to 101,325 Pa or 29.9212 inches Hg or 760 mm Hg or 14.696 psi.

P_h= P_0 e^{\frac {-mgh}{kT}}

P_0= sea level pressure

P_h= pressure at height h

g= Acceleration due to gravity

K= Boltzmann’s Constant (Ideal gas constant divided by Avogadro’s number)

T= Absolute Temperature

M= Mass of one air molecule

Safety Measures

1) It is highly recommended to wear safety glasses to protect your eyes.

2) Handle the hot glue or hot melting glue carefully otherwise children may burn their hands

3) Use kid-friendly knife

4) Always there must be an adult supervision while conducting this experiment

When you inflate the balloon, the air inside it creates potential energy and faces pressure against the rubber surface of balloon. And when the inflated balloon placed over the neck of the plastic bottle, the air pressure of balloon flows into it. This creates higher pressure on the top of the plastic bottle and thus creates even more pressure inside water in the bottle. This pressure moves water from the plastic bottle to the container placed beside it through the straw.

There are many ways to demonstrate pressure through our daily activities. Here is the easy one to explore or demonstrate pressure: 1) Take a plastic water bottle and fill it with water to its half way. 2) Place a straw into its neck part and seal the leaky edges using putty or clay. 3) Blow heavily into the straw which creates increased air pressure inside the bottle. 4) This increased pressure inside the bottle pushes the water out of straw like a fountain.

Water dispenser plays important role in restaurants, hotels, offices, etc. And it is the perfect example to demonstrate Air Pressure. Water dispenser is useful to supply normal to moderate to hot water whenever we press button. Water dispenser is a set-up of upside down 4-5 gallon water bottle at the top of the machine. Mostly, water dispensers work by pressing button, through which you are increasing the pressure inside by allowing the air inside the bottle. And that’s the way, you can dispense water from the machine when air allowed inside the bottle.

Air has mass as it contains a lot of tiny particles that possess weight. These particles when touched against any solid object, exerts pressure. The pressure exerted by air molecules in all directions around us, known as air pressure. However, because of the air particles weight, we experience more air pressure when we stay closer to the surface of Earth.

Take one litre plastic bottle and make a straw size hole at the middle of it. Insert a straw through the hole and seal the leakages using clay or putty. Outside the bottle and under the other open end of the straw, place a small container. Now, fill half of the bottle with water and cover its mouth using inflated balloon. When you release the air inside the balloon, there creates high pressure inside the bottle and water. Thus, the water is let outside the bottle through the straw and into the container placed beside the bottle.

Here are some of the situations where we use air pressure in everyday life: 1) When we drink through straw, the air pressure inside it decreases while outside pressure increases and forces the drink to suck inside the straw. 2) Consider a vacuum cleaner, it has a fan inside it which creates low pressure environment inside the machine. Whereas the outside atmospheric pressure forced inside and takes the dirt and air molecules to suck inside the machine. 3) Syringes creates pressure by plunging the nob of it while taking the blood from human body. This pressure sucks the blood from human body into the syringe easily.

1) The pressure of air inside car tires holds the car weight 2) The flight movement up in the sky because of the air pressure on its wings. 3) Bullet firing from the gun using gas pressure. 4) Inflation of balloon because of air pressure developed inside. 5) Sucking a drink through straw using pressure created inside it.

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Balloon in a Bottle Experiment

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This super easy and fun experiment is a great and safe way for kids and curious adults to learn about air pressure and how it affects everything from balloons to the weather around us. Let’s jump in and learn together with this Balloon in a Bottle Experiment.

Check out more fun and simple Plastic Bottle Experiments right here!

The best thing about this experiment is that you should be able to round up a few simple materials around your house to do it!

Table of Contents

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Supplies Needed:

• 1 Large balloon
• A plastic bottle
• A needle or pi n

How to get a balloon in a bottle

• Connect a large balloon to the opening of a clear, empty plastic bottle
• Push the deflated balloon into the bottle
• Try to inflate the balloon inside the bottle and see what happens
• Now use a needle or pin to poke a few small holes very close together on the bottle
• Repeat step 3 by trying to inflate the balloon inside the bottle.
• When the balloon has inflated inside the bottle, put your finger over the holes in the bottle, and observe what happens.

Step 1: Slide the mouth of a large balloon over the opening of a plastic bottle

Depending on what size of plastic bottle you have on hand for this experiment will determine what size of balloon you should use. I prefer to use a clean and empty 2-liter plastic bottle with a fairly large balloon.

These are the balloons like I like to use from Amazon . You can also use smaller balloons with a smaller water bottle, Gatorade bottle, or 20 oz soda bottle for this experiment as well.

The larger balloons just tend to work better and are much easier to stretch to fit over the opening of the plastic bottle.

Step 2: Push the deflated balloon into the bottle

Once you have connected your balloon to the bottle, go ahead and push the balloon into the bottle. You should be able to use your finger to do this, but if you have a large balloon and large bottle you might want to use the end of a wooden spoon or dowel to push the balloon inside.

Step 3: Use your hot air and try to inflate the balloon inside the bottle

Now it’s time for the hard part of blowing up the balloon inside the bottle! It seems like a pretty easy task to put the bottle up to your mouth and blow the balloon up inside the bottle right!?

Well if your lung capacity is anything like mine, you will find that inflating a balloon inside a bottle is a very very difficult and nearly impossible thing to do!

The difficulty of inflating a balloon in a bottle is thanks to the air inside the bottle not having an escape route to make room for the growing balloon. But there is a little trick we can do to help that air escape and the balloon to inflate!

Step 4: Grab a needle or a sharp pin to poke some holes in the bottle

Now that we have learned that it is pretty much impossible to inflate a balloon inside a bottle without a way for the existing air to escape, its time to create an escape route for that air in the bottle!

If children are participating in this experiment, please make sure to have an adult supervising while using the poky and sharp needles and pins for this step. Then go ahead and carefully poke a few very small holes close together on the bottle.

You will want to poke 4 or 5 holes in the bottle with a sharp needle, thumbtack, or sewing pin. Make sure the holes are very close together and in a location on the bottle that you can easily cover with your finger when holding the bottle.

Step 5: Try to inflate the balloon inside the bottle again

Repeat Step 3 and try to inflate the balloon inside the bottle now that you have put a few holes in the bottle. What happens!!!?

You should have a much easier time using the air in your lungs to inflate the balloon inside the bottle now that the air inside the bottle can escape as the balloon expands!

Step 6: Block the holes in the bottle with your finger while removing your mouth from the balloon

This is the coolest part of this balloon in a bottle experiment! While the balloon is still blown-up inside your bottle, slide your finger over the small holes you poked in the bottle. Then take your mouth off the end of the balloon and watch what happens!

You would expect the air inside the balloon to rush out of the opening of the bottle where the balloon is attached, but instead, the balloon somehow stays inflated inside the bottle!

The balloon will stay inflated inside the bottle as long as the holes on the side of the bottle remain plugged with your finger. If you remove your finger from the holes in the bottle, the increasing air pressure inside the bottle will then cause the balloon to deflate again.

Air pressure experiment with water bottle and balloon explanation

The fascinating science behind this balloon in a bottle experiment all depends on something we can’t see…air pressure! That’s right! The difference between the air pressure inside the bottle compared to the air pressure outside the bottle is what makes this experiment possible.

Let’s break this air pressure concept down a little bit further. In the wonderful world of weather high pressure always flows towards low pressure. This is why air is pushed out and away from a high-pressure weather system and the air is pulled in and towards a low-pressure system.

When relating this air pressure concept to this ballon in a bottle experiment we can visually see this process working thanks to the balloon inflating and deflating depending on the air pressure.

At first it is nearly impossible to inflate the balloon inside the bottle because the air inside the bottle is taking up too much space for the balloon to expand. When a few small holes are made in the bottle it lets the air escape and the air pressure drops.

The lower pressure created inside the bottle then allows the air with a higher pressure inside the balloon to expand and fill the empty space in the bottle.

Once the balloon is inflated inside the bottle, it will stay inflated if you cover the holes on the side of the bottle and release your mouth from the balloon thanks to a process called equilibrium pressure .

Equilibrium pressure occurs when the air pressure on the outside of the bottle is trying to become equal to the air pressure inside the bottle. Since the pressure in the bottle is now lower than outside the bottle, the higher pressure air on the outside will try to get inside the bottle.

If the holes on the side of the bottle are still plugged, then the only way for air to get into the bottle is through the opening of the bottle and into the balloon. This air pushing into the balloon trying to get into the bottle will keep it inflated.

Eventually, when you release your finger from the holes in the side of the bottle, the higher pressure on the outside with rush into the bottle. This will balance the air pressure inside the bottle and in the balloon and the balloon with naturally deflate.

How does air pressure influence cloud development?

Did you know we can also witness air pressure changes happening on a daily basis when we look in the sky and see clouds forming!? The higher a cloud gets in the sky, the lower the air pressure is surrounding it and the cloud will continue to grow and expand.

Check out this awesome experiment 3 Easy Ways To Make a Cloud in a Bottle if you want to make your own clouds and learn more about how clouds are formed!

If a cloud is in an environment of high-pressure, then the air pressure around the cloud will be higher than within the cloud and the cloud will actually shrink and eventually vanish.

This is the same reason why when you see a high-pressure symbol on a weather map you can usually expect sunny and clear skies, but when you see a low-pressure moving your way you better get ready for stormy, cloudy weather!

More Fun and Educational Science Experiments for Kids:

• Egg In a Bottle Experiment
• How To Make A Cloud In A Water Bottle
• Dancing Raisins Experiment

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Science project, air pressure science experiment: balloon and a jar.

Grade Level: Kindergarten to 2nd (with adult supervision!); Type: Physics

Use heat to change the air pressure inside a bottle causing a balloon set on top of the bottle to squeeze into it.

Research Questions:

When you first set the water balloon on top of the jar, the air pressure outside the jar and the air pressure inside the jar are the same. As the fire burns, air, heated by the fire. rises and pushes its way out of the jar. This hot air pushing out past the balloon causes the balloon to wiggle. However, while hot air is going out, no new air is coming in (the balloon works like a one-way valve, letting air out but not in). So now there is less air, less stuff, in the jar. With less stuff taking up space in the jar, the pressure inside the jar is less than it used to be, that is, less than the air pressure outside the jar. Since the pressure outside the jar is now greater than the pressure inside the jar, what will happen to the balloon?

• One large glass jar (a big maraschino cherry jar from a bar works well)
• One balloon
• A bit of paper

Experimental Procedure:

• Fill the balloon with water until it’s a little too big to fit through the mouth of the jar.
• Light a bit of paper on fire and drop it into the jar.
• Quickly place the balloon on top of the jar.
• Observe carefully.

 Terms & Concepts: Air Pressure

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Home » Articles » STEM » STEM Science » How to Demonstrate Air Pressure with Balloon

How to Demonstrate Air Pressure with Balloon

How to fit an object through a smaller hole not easy, that is for sure. but we can turn towards science and get some help from atmospheric pressure. so let’s do just that – fit the balloon into the glass jar by using the air pressure, article contents.

What is air pressure or atmospheric pressure?

The pressure that is all around us is called air pressure or atmospheric pressure . We define it as the force exerted on a surface by the air above the object, as the gravity pulls that air towards the ground. Another popular definition: Atmospheric pressure is the force per unit area exerted by the mass of the atmosphere as gravity pulls it to Earth.

We measure atmospheric pressure or barometric pressure with a device called a barometer . The unit we use to measure atmospheric pressure is atm. Atm stands for the standard atmosphere and it’s a unit of pressure defined as 101,325 Pa (pascal). Atm is equal to Earth’s average air pressure at sea level.

We already talked a lot about air pressure in How to Demonstrate Air Pressure with Can Crush Experiment. We suggest you check it out for more information.

What are balloons made of?

Balloon production came a long way from when it was first invented. The first balloons were made from animal intestines and bladders. Nowadays, balloons are made mostly from latex , rubber, and nylon fabric .

These materials are long particles called polymers . Polymers are elastic , which means they will scratch when you pull them and shrink when you let them go. As mentioned, latex, rubber, and nylon fabric are all made of polymers and that is why they are the most popular materials to produce balloons nowadays.

We already talked a lot about balloons in the 5 amazing Balloon experiments article, so check it out to learn more. Also, we recommend you check this great video that shows the industrial process of balloon making .

Required materials for balloon air pressure experiment

• Balloon . Any balloon will do but we recommend using a water balloon. Water balloons are small enough to best fit the jar opening and are designed to be filled with water. Also, they come in packs so you will have some spare balloons if the balloon breaks before the experiment is done.
• Glass Jar . Any glass jar will serve as long as the balloon can fit through the opening. A pickle jar, olives jar, or jam jar will be great for the experiment.
• Lighter or matches . We will need a lighter or matches to set the paper at flame before putting it into the jar. Have some spare matches or enough gas in the lighter if you need to light the fire again since the fire can die out in the jar.
• Piece of paper . Any paper will be great as long as it wants to burn. Not much paper is needed, just enough to fill the bottom of the jar. So the bigger the jar, the bigger piece of paper you will need.
• A glass of water . Since we are dealing with fire, it is always good to have some water by hand. That is why we recommend you have some water in a glass or bottle next to you when conducting this experiment.

Instructions to make balloon air pressure experiment

If you would rather like to watch the “how-to” video for this experiment, we have added the video at the beginning of the article. And for a step-by-step guide, continue reading the instructions below.

Warning : Since this experiment requires some fire, it is strongly recommended to conduct the activity outside, in a safe environment. Also, this activity should be conducted under the supervision of adults for all under-aged children.

• Take the balloon and fill it with water. We need water inside of the balloon so it can withstand the heat from the fire and not explode which can happen with only air inside. A water balloon is the best for this activity since it is made for holding water. Attach the balloon to the water pipe and fill the balloon.
• After the balloon is filled, remove it from the pipe, but don’t tie it up just yet. Take the glass jar and see how the balloon fits the opening . Make sure the balloon can’t fall inside of the jar, but also make sure it is not that much bigger than the opening. You can spill some water out of the balloon if it is too big to make it fit the jar opening better.
• Tie the balloon . This can be tricky but there are many ways we can do this. If you can’t use the balloon end to tie it up around itself, you can use some wool or thin rope to tie the balloon. After tying the balloon, we are ready for the experiment.
• We strongly suggest you go outside for the next steps. There could be smoke and you probably don’t want the smoke indoors.
• Take a piece of paper and light it with matches or a lighter . Make sure the paper is burning and if the fire goes off, light it again. The fire must be burning to create pressure.
• Put the burning paper inside of the glass jar . If the paper is still burning inside, proceed to the next step. If the fire went off, light the paper again.
• Put the balloon on top of the jar opening . Observe what is happening. You will see the balloon being sucked inside of the jar due to created pressure.
• After the balloon is sucked in, we recommend you take a prepared glass or bottle of water and pour some water inside of the jar . This is a safety precaution to make sure there is no more fire.
• And you are done! Now it’s time for discussion about what happened in the experiment.

The science behind the air pressure experiment with a balloon

When we place the inflated balloon or balloon filled with water atop the jar, the balloon won’t fall through the opening. Since the air inside of the jar is preventing it from falling down, and the balloon covers the whole opening, it will just sit atop the jar. At this time, the air pressure is the same inside, and outside of the jar.

To get the balloon sucked into the jar, we need to create the difference in air pressure . When we start the fire inside the jar, the temperature rises and the air inside gets warm . Warm air spreads more and is less dense, which means the pressure decreases since the air gets warmer.

When we put the balloon on top of the jar, we prevent new air from coming inside of the jar . The balloon acts as a one-way barrier , preventing new air to come in but letting the hot air go out. As the air inside of the jar gets warmer, it will escape the jar, but new air won’t come in. If you see a balloon shake, that means the hot air is coming out and shaking the balloon. 

And as more air goes out of the jar, the difference in air pressure becomes higher – low pressure inside of the jar and higher pressure outside of the jar.

And since the pressures want to achieve equilibrium again, the balloon is sucked in until the air outside can again find some way to enter the jar – by pushing the balloon inside of the jar and opening the hole for the free flow of air again.

What will you learn and what skills will you develop?

• Learning about air pressure . You will learn about what is air pressure, differences in air pressure, and how to demonstrate different air pressures. Also, you will see what happens when air pressure is out of balance.
• Learn about balloons . You will learn about balloon properties and the materials they are made of which is all part of the chemistry knowledge.
• Conducting scientific experiments . Demonstrating air pressure with a balloon is a scientific method and you will learn how to plan, prepare, conduct experiments, and in the end analyze and draw conclusions.
• Develop judgment and critical thinking . By talking about procedure and results, we develop our analytical thinking and judgment. We can also discuss what can be done differently and further develop our divergent thinking .
• Build awareness about needed safety precautions . You will build awareness and learn about safety measurements that we should always take when doing experiments. In our case, to go outside and have water close by since we were making fire.

We hope you enjoyed this experiment and learned something new about atmospheric pressure. If you’re interested in more similar activities and fun experiments, we have some recommendations:

• As already mentioned, if you want to demonstrate air pressure with one more activity, you can try the Can Crush Experiment .
• Another great way to see how air pressure works is by getting the water raise. You can see how to do that in the Candle in the vacuum experiment .
• And if you just want more balloon activities, we have plenty more in 5 amazing Balloon experiments article.
• We also recommend another interesting and simple experiment to demonstrate buoyancy with the Orange density experiment .

We wish you happy and successful experimentation! But no pressure 😉

If you’re searching for some great STEM Activities for Kids and Child development tips, you’re in the right place! Check the Categories below to find the right activity for you.

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Videos, guides and explanations about STEM Science in a step-by-step way with materials you probably already have at your home. Find new Science ideas.

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Balloon Air Pressure Experiment for Kids

By: Author Darcy Zalewski

Posted on Last updated: December 22, 2023

We love engaging in fun and educational projects that entertain as well as educate kids. One such project is the Balloon Air Pressure Experiment .

This experiment is specifically designed to ignite the curiosity of young minds. While this experiment does require your guidance and supervision, rest assured that it will be an enjoyable experience for both you and the children.

You can find even more fun, easy science experiments to do at home in our free 30 Day Science Activity Planner for Kids .

What can you do with a balloon, a match, a piece of paper, and a jar? Learn about air pressure, of course!

This fun science experiment shows kids how air pressure works, and what happens when the air pressure inside a jar is changed. Kids will be fascinated with how the balloon is sucked right into the jar.

The Balloon Air Pressure Experiment has proven to be a fantastic choice for science fair projects, especially those focusing on air pressure.

By delving into the intricacies of this experiment, the kids will gain a deeper appreciation for the wonders of science and its practical applications.

Fun Science Activities for Kids

Looking for fun science activities to engage your kids at home? Look no further! The Balloon Air Pressure Experiment is just the beginning of the exciting world of STEM activities for budding young scientists.

Encourage kids to explore and learn about chemical reactions with the Melting Rainbows Experiment , perfect for preschoolers.

Science Bingo is also a great way to bring new scientific vocabulary to the table while having fun as a family. For older kids, try Science Pictionary ! It’s a great way to apply knowledge of scientific terms while having a blast.

And nothing sparks curiosity quite like rocket science! Give your kids a fun introduction with the Balloon Rocket Experiment .

These ideas not only spark curiosity but also get kids interested in science by encouraging them to explore, learn, and have fun with science.

Why is Science Important for Kids?

Science plays an essential role in children’s education, paving the way for them to understand the world around them. It cultivates curiosity, fuels their inquisitive nature, and encourages analytical thinking.

Science aids in developing skills like problem-solving, logical reasoning, and decision-making, which are not only beneficial in academics but also critical for life outside the classroom.

For example, if the kids are working on a Straw Rocket STEM Challenge , they might test out different rocket designs and compare their results.

Moreover, through science, children learn that failure is a part of the discovery process and it can lead to more significant breakthroughs, teaching them resilience and perseverance.

By fostering a strong foundation in science early on, we lay the groundwork for future innovators, thinkers, and problem-solvers. Which is important because we need more kids to pursue science careers .

Recommended Science Books

Discover the world of science through the myriad of books specially curated for young minds. Here’s a list of recommended science books that will fuel curiosity and deepen your child’s understanding of the world around them.

This post contains affiliate links. As an Amazon Associate and a participant in other affiliate programs, we earn a commission on qualifying purchases.

Balloon Air Pressure Experiment Supplies

Before diving into the exciting world of the Balloon Air Pressure Experiment, it’s important to remember that safety comes first.

This particular experiment involves elements like fire from matches, which can be dangerous if not handled properly.

Therefore, it’s strongly recommended that children only observe this experiment, and an adult should conduct the demonstration.

Ready for the demonstration? Here’s what you’ll need:

• Glass Mason Jar

With these supplies at hand, you’re all set to explore the fascinating concepts of air pressure in a visual, engaging, and memorable way.

Remember, the goal is to learn and have fun, but always within safe boundaries.

How to Conduct a Balloon Air Pressure Experiment

Fill the balloon with water until it becomes too large to fit inside the jar and rests on top.

Demonstrate to the children how the balloon cannot pass through the opening. Then ask the kids the following question: Do you think it’s possible for the balloon to enter the jar?

Using the matches (or a lighter), ignite a piece of paper and drop it into the jar. Then place the balloon on top.

The balloon will start to tremble slightly and then be pulled into the jar. It may not be fully sucked in, but should go about halfway.

Once the fire extinguishes and the jar cools down, challenge the children to remove the balloon. It will require some effort to free it!

If you want to make this experience even more enjoyable for your children, allow them to draw on the balloons before filling them with water.

Assign each child their own balloon and repeat the experiment multiple times. This will give you an opportunity to observe which balloon worked best or was the most challenging to remove.

Although all balloons should function similarly, there may be slight variations, and children will delight in the competitive spirit.

What is Air Pressure in Science?

Air pressure in science refers to the force exerted by the weight of air onto a surface. This is also known as atmospheric pressure.

It is an essential concept in the study of weather, as changes in air pressure can lead to changes in weather patterns.

At sea level, the average air pressure is about 14.7 pounds per square inch, but it can vary depending on altitude and weather conditions.

In our experiment, the heat from the burning paper caused the air inside the jar to expand, reducing its pressure.

The higher pressure outside the jar then pushed the balloon into the jar, demonstrating how air pressure can move objects.

How to Use an Air Pressure Experiment to Teach Kids

The balloon is drawn into the jar due to air pressure. When the piece of paper is heated, it generates hot air that escapes around the balloon. This escaping hot air causes the balloon to initially shake.

However, because the balloon is made of latex it creates a seal and no fresh air enters the jar, creating a low-pressure system inside. Consequently, the balloon is pulled into the jar.

Incorporating air pressure experiments into homeschool lessons is an excellent way to educate children about this phenomenon. It seamlessly complements weather studies for learners of all ages.

Weather Systems: Extend the experiment to demonstrate how low- and high-pressure systems affect weather. Explain that when air heats up, it expands and creates a low-pressure area, similar to the jar.

This is often associated with warmer weather and possibly rain. Conversely, cooled air contracts, creating high-pressure areas often associated with colder and clearer weather. Show that the balloon being sucked into the jar is similar to air being drawn into low-pressure areas, causing wind.

Mountain Climbing: Use the experiment to discuss why it’s harder to breathe at higher altitudes. Explain that as you ascend a mountain, air pressure decreases, making the air thinner and harder to breathe.

Communicating Weather Forecasts: Use the experiment to help children understand why and how weather forecasts are made. They can also use a printable weather wheel to help compare and discuss forecasts and the current weather conditions.

Then discuss how meteorologists use barometers to measure air pressure and predict weather changes.

Draw parallels between the jar experiment and the pressure readings on a barometer: higher pressure (balloon out of the jar) usually means good weather, while lower pressure (balloon in the jar) could mean a storm is coming.

Fun Science Kits for Kids

Check out these fun and educational science kits available on Amazon. They offer a hands-on approach to learning and make scientific concepts tangible for children.

More Easy Science Activities to Do at Home

Ready for more explorations in science right at your doorstep? Let’s look into an exciting range of simple, yet intriguing science activities that you can effortlessly set up at home to further ignite your child’s curiosity.

• Outdoor Science Lessons to Teach This Summer
• Hurricane in a Jar
• Liquid or Solid Science Experiment
• Dinosaur Science Experiments

Exploring science with hands-on activities like the balloon and jar air pressure experiment brings the subject alive for kids.

These activities not only nurture their curiosity but also provide them with a solid understanding of scientific concepts.

Whether it’s delving into meteorology or understanding the nuances of mountain climbing, home-based science experiments make learning an engaging and enjoyable process.

So, why wait? Turn your home into a mini science laboratory and let your child’s scientific journey begin!

Balloon Air Pressure Science Experiment

Have kids observe and learn about air pressure with this science experiment using a balloon and a glass jar.

Instructions

• Fill the balloon with water so that it is just too large to fit down inside the jar and rests on top.
• Show the kids how the balloon won’t fit through the opening. Ask the kids if they think it is possible for the balloon to enter the jar.
• Light a piece of paper on fire and drop it into the jar. Place the balloon on top.
• The balloon will start to shake a bit, then be sucked into the jar. It probably won’t be sucked in all the way, but about halfway into the jar.
• Once the fire dies and the jar cools, have the kids see if they can pull the balloon out. It will take a bit of work to get it loose!

This science activity requires adult supervision.

Did you make this project?

Please leave a comment on the blog or share a photo on Pinterest

Darcy is the founder of “Life With Darcy and Brian,” where she combines her love for education, board games, and crafting to create engaging learning experiences for kids. Her creative projects and writing have been featured in outlets like The Toy Insider, CafeMom, Mom.com, Parents.com, Country Living, and The Pioneer Woman.

Monday 27th of July 2020

I love this type of hands on science learning experiment. My kids will love the air pressure lesson they will get all while playing with a balloon. Big thumbs up. Thanks!

Darcy Zalewski

Friday 31st of July 2020

Thanks, Scarlet! It's a great visual for them! Hope they enjoy this activity.

Monday 18th of May 2020

Thanks for this! We are always looking for fun, science experiments to do!

Sunday 31st of May 2020

The kids think this one is so neat. Thanks for commenting, Raquel!

Melissa Taylor

what a fun idea, thanks!

You're welcome, Melissa! I hope you enjoy doing this experiment.

100 FUN Science Fair Project Ideas - Teach Beside Me

Thursday 13th of June 2019

[…] Balloon Air Pressure Experiment ~ Darcy and Brian […]

Balloon Bonanza Reboot! - Prosser Public Library

Monday 1st of April 2019

[…] was inspired to do this demonstration after reading a blog post by Darcy Zalewski. With just a few simple supplies you can demonstrate low air […]

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Air Pressure Demonstration – Drinks Dispenser

February 24, 2019 By Emma Vanstone Leave a Comment

This easy activity is super simple and great for learning about air pressure with a practical use as well!

What is air pressure?

Air and its particles are crashing into us all the time. What we call air pressure is the force of these particles hitting a surface.

When you suck a straw you reduce the pressure inside the straw, making the pressure outside the straw acting on the liquid greater than the pressure inside the straw. This pushes the liquid up the straw, allowing you to drink it!

For this air pressure experiment you’ll need

Peg – optional, but helpful

Plastic bottle – I used a 750ml bottle

Plasticine or putty

Plastic Straw

Small container

How to make an air pressure drinks dispenser

Carefully make a small hole about half way up the bottle and push the straw through the bottle leaving ⅓ to ½ on the outside.

Fill the bottle about three quarters full of water.

Blow up the balloon, twist and seal the neck with a peg. Carefully place the end of the balloon on the bottle neck and place a glass under the straw.

When you’re ready remove the peg and watch as the water shoots out of the straw into the glass!

Be careful as it might shoot out further than you expect.

Why does this happen?

Air presses down equally on the water in the bottle and in the straw when there is no balloon present ( or the balloon is pegged ) but when the peg is removed, air from the balloon increases the air pressure in the bottle which pushes down on the water, forcing it through the straw.

More Air Pressure Experiments

Demonstrate the Bernoulli Principle with this easy demonstration using a plastic bottle and ball of paper.

Suck a boiled egg into a jar without touching it.

Build and launch a bottle rocket !

Last Updated on November 18, 2021 by Emma Vanstone

Safety Notice

Science Sparks ( Wild Sparks Enterprises Ltd ) are not liable for the actions of activity of any person who uses the information in this resource or in any of the suggested further resources. Science Sparks assume no liability with regard to injuries or damage to property that may occur as a result of using the information and carrying out the practical activities contained in this resource or in any of the suggested further resources.

These activities are designed to be carried out by children working with a parent, guardian or other appropriate adult. The adult involved is fully responsible for ensuring that the activities are carried out safely.

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Water Balloon in a Bottle Air Pressure Science Experiment

Posted on Published: October 15, 2018  - Last updated: May 25, 2021

Use heat to change the air pressure inside a bottle causing a water balloon to squeeze into a bottle with this water balloon in a bottle low-prep STEM experiment !

The egg or balloon in a bottle experiment is a total classic and one we could definitely not exclude from our low-prep STEAM activities! It takes just a few minutes to do and sets the stage for a lot of great questions and exploration!

I have to admit, I had a bit of trouble keeping my paper lit, but after some tenacity and discussion about changing my method we managed to get it to work a few times for us and it was totally worth it!

This post contains affiliate links. As an Amazon Associate, Our Family Code earns from qualifying purchases. Please see our Disclosure Policy for more details.

Why STEAM Activities?

STEAM is the abbreviation for Science, Technology, Engineering, Art, and Math.

STEAM, like STEM, is an integrated approach to learning that encourages learners to make connections between the concepts they are learning and how they apply them to real-world problems.

STEAM helps students ask questions, problem solve, think creatively, and produce innovative solutions. Many schools have adopted STEAM learning activities into their curriculum, but it’s never too early to start building critical thinking skills.

We love to learn through play at our house and have a blast doing activities for toddlers all the way to tweens!

Looking for some more hands-on activities that incorporate Science, Technology, Engineering, Art, and Math (STEAM)? Then you have to check out STEAM Kids! 

This book features more than 50 hands-on activities that are organized into easy to implement categories, so you know exactly what concepts your kids are learning! 

Grab your copy from A mazon today  or get instant access to this great book by purchasing a downloadable PDF !

Under Pressure! Water Balloon in a Bottle Activity Materials

• Large glass bottle (We used a Pyrex bottle because it is designed for high heat applications, which is important for this task!)
• Paper/Coffee Filters/Birthday Candle
• Lighter/Matches

CAUTION : Please make sure to take appropriate safety precautions while doing this experiment and only conduct this experiment under adult supervision.

Fill your balloon with water so that it is slightly larger than the mouth of your glass and tie a knot. Make sure the outside of your balloon is slightly wet.

If your balloon is too big then it will go into the bottle and stop. This happened to us…a bunch!

Use a lighter or match to light a small piece of paper. Let it burn for a second before dropping it into your bottle. Ultimately, a coffee filter was the most effective way for us to keep a flame going in our bottle.

Place your balloon on top of the bottle. Make sure your knot is not in the way. It takes about 30 seconds for the balloon to get sucked into the bottle. If it gets stuck, you might have too much water. You can try again with a smaller balloon.

The Science Behind the Water Balloon inside a Bottle Activity

Just like the classic egg in the bottle experiment, this experiment demonstrates how air pressure can be used to push a water balloon into a bottle. As the air inside of your bottle is heated by the burning paper, it expands.

The expanding air pushes up and escapes out the top of your bottle. You might notice your balloon bouncing a little bit while this is happening. Once your flame uses up all of the oxygen inside the bottle, it dies out.

The air inside of your bottle begins to cool and contract. Since your balloon is blocking the top of the bottle, air cannot enter the bottle, which forms a partial vacuum inside of the bottle. As the pressure inside of the bottle drops, the higher pressure outside of the bottle forces your water balloon into the bottle.

How to Get the Water Balloon Out of the Bottle

Because the water balloon is not firm, it is not possible to blow air into the bottle to get the balloon out. You also can’t pull the balloon out because it creates a perfect seal. Trying to pull the water balloon out might burst the balloon.

To remove the balloon, you’ll need to use a straw or similar object to equalize the air pressure, which will make it much easier to remove the balloon from the bottle.

Want to connect this Balloon in a Bottle Activity with other STEAM buckets?

Check out these STEAM extensions!

Try the classic egg in a bottle experiment with a hard boiled egg! Compare the similarities and differences between using a water balloon and a hard-boiled egg.

Make a stop motion video of your demonstration! Share with friends!

Engineering

Make a Balloon Car !

Use your balloons to do some balloon painting!

Weigh your water balloon and your bottle before your experiment. Then weigh them after the balloon is in the bottle. What do you notice?

Some Books to Read with Your Air Pressure Science Activity

We love incorporating books into our activities. Here are some great books about science to read with your activity!

• Ada Twist, Scientist by Andrea Beaty
• Say Zoop! by Herve Tullet
• The Most Magnificent Thing by Ashley Spires

Similar STEAM Activities

• We Put the Boo in KaBOOm with this STEAM Activity
• Exploding Pumpkin STEAM Challenge
• Exploring Velocity with Straw Art

31 Days of Low-Prep STEAM Activities for Kids

This activity is part of our 31 Days of Low-Prep STEAM Activities for Kids . Every activity will primarily focus on each of the buckets of STEAM ( Science , Technology , Engineering , Art , & Math ) although these integrated projects fit in more than one bucket.

You and your kiddos are going to love all of the activities that we have in store! Visit the 31 Days of Low-Prep STEAM Activity hub and pin it, so you can come back and visit it daily!

PIN THIS IMAGE TO SHARE THIS LOW-PREP STEAM ACTIVITY!

Meet Toni, the Maker Mom behind Our Family Code

Hey there , I’m Toni! I’m a software engineer and Maker Mom that finds my joy in unleashing my children’s curiosity by exploring STEAM concepts with my fantastic five!

When I’m not chasing toddlers or raising tweens, you can find me tearing things up and putting them back together over here at  Our Family Code .

I am the owner and content creator of multiple educational websites designed to increase access to STEAM & STEM education with a focus on teaching computer science and coding to kids of all ages!

You can also find out more about me by visiting  ToniGardner.com !

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Harassedmom (@laurakim123)

Tuesday 16th of October 2018

How cool is this??? And so easy to try out. We are definitely going to be doing it

Cool Science Experiments Headquarters

Making Science Fun, Easy to Teach and Exciting to Learn!

Science Experiments

Use a Bottle to Blow-up a Balloon Science Experiment

Can science blow up a balloon?

In this easy science experiment, kids can explore how matter behaves when heated and cooled. Watch our demonstration video, gather your materials, print out your instruction sheet to get started. Then, discuss your findings with our easy to understand explanation of how it works below.

JUMP TO SECTION:   Instructions  |  Video Tutorial  |  How it Works

Supplies Needed

• 8-inch Balloon
• Empty 2-Liter Bottle
• 2 pans (I used 9-inch square pans)
• Enough Ice & Cold Water to Fill one Pan
• Enough Hot Boiling Water to Fill another Pan

Can a Bottle Blow up a Balloon Lab Kit – Only $5

Use our easy Can a Bottle Blow up a Balloon Lab Kit to grab your students’ attention without the stress of planning!

It’s everything you need to  make science easy for teachers and fun for students  — using inexpensive materials you probably already have in your storage closet!

Use a Bottle to Blow-up a Balloon Science Experiment Instructions

Step 1 – Start with an empty two-liter bottle and secure a balloon around the mouth of the bottle. Helpful Tip: 8-inch balloons work best for this experiment. When we tried this with a 10-inch balloon, it didn’t inflate entirely.

Step 2 – Prepare two pans of water. Fill one pan with ice and cold water. Fill the other pan with hot boiling water. What do you think will happen if you place the bottle in the pan with the hot water? What do you think will happen if you place the bottle in the pan with the cold water? Write down your hypothesis (prediction) and then follow the steps below.

Step 3 – Place the bottle in the pan with the hot water. Hold it in the pan for 30-40 seconds. Watch what happens to the balloon and make some observations. Does the balloon inflate? What do you think will happen if you remove the bottle from the pan with the hot water?

Step 4 – Remove the bottle from the hot water and place it on the table for a few seconds. Notice that the balloon stays inflated. What do you think will happen if you put the bottle in the pan with the cold water? Is this different than your first prediction?

Step 5 – Place the bottle in the pan with the cold water. Hold it in the pan for 30-40 seconds. Watch what happens to the balloon and make some observations. Does the balloon deflate? What do you think will happen if you remove the bottle from the pan with the cold water? 

Step 6 – Remove the bottle from the cold water and place it on the table. The balloon will remain deflated.

Do you know the why the balloon inflated and deflated throughout the experiment? Find out the answer in the how does this experiment work section below.

Video Tutorial

How Does the Science Experiment Work

Even though the bottle looks empty, it is actually filled with air. By placing the balloon on top of the bottle, you trap the air inside of the bottle. This experiment is a great way to show how matter behaves when it is heated and cooled. Matter expands (gets bigger) when heated and contracts (gets smaller) when cooled.

When the bottle is placed into the pan of hot water, the heat from the water causes the air inside the bottle to heat up. As the air in the bottle heats up, the molecules of the air begin to move faster and take up more space. The air from the bottle then moves into the balloon causing it to inflate.

When the bottle is removed from the hot water, the balloon will stay inflated. This is because the air molecules in the bottle are still hot. If you leave the bottle out of the water for a while, it will eventually cool down. When the air in the bottle cools down, the molecules of air slow down, move closer together, and take up less space. This will cause the balloon to deflate.

When the bottle is placed into the pan of ice-cold water, the cold water causes the air inside the bottle to cool down. As the air in the bottle cools down, the molecules of the air slow down and take up less space because they move closer together. The air then moves out of the balloon and back into the bottle, causing the balloon to deflate.

More Science Fun

Want to learn more about what air can do? Then check out these other simple and fun experiments:

• Stab a Straw through a Potato – Yes, it really is possible and it’s all because of Air Pressure
• Upside down Water Glass – Turn a glass full of water upside down…without spilling a drop!
• Keep Towel Dry Under Water – Use simple science to keep the paper towel dry after submerging it in water

I hope you enjoyed the experiment. Here are some printable instructions:

• 8 inch Balloon
• Empty 2 Liter Bottle
• 2 pans (I used 9inch square pans)

Instructions

• Start with an empty two liter bottle and secure a balloon around the mouth of the bottle. Helpful Tip: 8inch balloons work best for this experiment. When we tried with a 10inch balloon, it didn’t inflate entirely.
• Prepare two pans of water. Fill one pan with ice and cold water. Fill the other pan with hot boiling water.
• Place the bottle in the pan with the hot water. Hold it in the pan for 30-40 seconds and watch the balloon inflate.
• Remove the bottle from the hot water and place on the table for a few seconds. Notice that the balloon stays inflated.
• Place the bottle in the pan with the cold water. Hold it in the pan for 30-40 seconds and water the balloon deflate.
• Remove the bottle from the cold water and place on the table. The balloon will remain deflated.

Reader Interactions

July 26, 2017 at 1:07 pm

I never knew you could inflate a balloon using a bottle! My kid is having a birthday party and I have been put in charge of balloon decorations. I think my little guy will like the neat little bottle trick, thanks!

February 7, 2022 at 9:50 pm

Nice experiment about the properties of matter by using the balloon.

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Air Science Experiment: Balloon in a bottle

More like a magic trick than a science experiment, Balloon in a bottle is a great way to fool your friends.  Learn how to blow up a balloon in a bottle, AND keep it inflated without closing the mouth of the balloon!  People will be amazed at what your secret knowledge of air pressure will let you do.

An experiment about Air:  Balloon in a bottle

What you will need:.

•  A large empty plastic drink bottle •  A thumb tack or push pin •  A balloon

What you will do:

1.  Place the balloon inside the bottle and loop the mouth of the balloon over the mouth of the bottle. 2.  Now blow the balloon up inside the bottle.  Can’t do it?  Why is that do you think? 3.   Lay the bottle down on its side and carefully poke a hole in the bottom of the bottle.   Now poke another 2 or 3 holes right beside the first one so that the hole gets a little bigger. 4.  Now try blowing up the balloon in the bottle. 5.  Here’s an extra trick:  as soon as you are finished blowing, put your finger over the hole.  Take the bottle from your mouth, keeping your finder on the hole but don’t cover the end of the balloon.  The balloon stays blown up!  It’s amazing!

What is going on?

Even though we can’t see the air in the empty bottle, it is there and it’s taking up space.  When you try to blow up the balloon, you are trying to add extra air to the bottle, but there is no room for it.  When you put a hole in the bottle the air from the bottle can escape when you blow new air into the balloon.  If you put your finger over the hole you stop outside air getting back into the bottle, so it can’t rush in and push the air out of the balloon – the balloon stays blown up.

Monster Challenges:

• How could you use this experiment to trick your friends? Perhaps you could give them a bottle without a hole, and challenge them to a balloon blowing race.  Or you could challenge them to make a balloon stay blown up without closing the mouth of the balloon. • How else could we get the balloon to inflate without the hole in the bottle? What do you already know about air compression and air temperature that might help?

TEACHING NOTES:                  Monster Sciences Experiment: Air A10

Air: Air pressure

Key Concepts:

Air takes up space.

• Experiment Description Air A09 – one copy per student • Investigation Report IR01 – one copy per student • large empty drink bottles, balloons, thumbtacks, pens

Lesson Notes:

I always do this experiment in pairs or small groups so that they can discuss their observations and discoveries.  Begin by explaining the experiment and reminding students of your safety requirements regarding the thumbtacks.  It doesn’t matter where the hole i put in the bottom on the bottle but I suggest that they think about how they are going to put their finger over it later so that they put it in a sensible place.  They can also cover the hole with tape or poster tak later if they want to trick someone else.

Remind students to listen carefully to instructions, and to OBSERVE their experiment.

As a class discuss the experiment prior to undertaking it, and students should complete the sections of their Investigation Report IR01 from ”Title to “Hypothesis”.

What should happen in this experiment, and why?

Without the hole in the bottle the balloon can’t be blown up because the bottle is already full of air so no more air can be blown into it.  Once the hole is in the bottle, the air from the bottle can escape and the balloon can be inflated.  If the hole in the bottle is then covered, it will prevent the air flowing back into the bottle, otherwise it would push the air back out of the balloon.

These Monster challenge questions are about thinking about what they already know about air and applying it to this current experiment.  Students should already be aware that cold air takes up less space that hot air, so they should be able to suggest cooling the air in the bottle.  You may enen like to give it a go.  They should also know that it is possible to compress air, but our lungs are not strong enough to do it for this experiment.  Students may suggest other ways to compress the air in the bottle like using a bike pump to fill the balloon.

Follow up questions:

•  Would this experiment change if we used a bigger bottle?  A smaller one? [no, no matter how big or small the bottle is it will still be full of air]

Get this experiment here or as part of a bundle of Air Experiments here .

© www.monstersciences.com

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Top 10 Air Pressure Experiments: Fun & Easy

Are you ready to be blown away by some exciting air pressure experiments?

Air pressure experiments can be a great way to spark students’ interest in science and encourage them to explore the world around them.

These hands-on experiments help students better understand the properties of air and how it behaves under different conditions, such as changes in pressure or temperature.

1. Balloon-Powered DIY Drink Dispenser

Get ready to impress your guests with your very own balloon-powered drink dispenser and discover the amazing potential of air pressure!

This experiment showcases the principles of air pressure and fluid dynamics, making it an excellent opportunity for students and science enthusiasts to learn about these fundamental concepts in a fun and engaging way.

2. Make A Bottle Rocket

Get ready for lift-off with this exciting experiment that will have you launching your very own bottle rocket! By harnessing the power of air pressure, you can create a simple yet thrilling rocket that flies high into the sky.

Learn more: Make a Bottle Rocket

3. Flying Ping-Pong

With one hand, place the ping-pong ball over the paper cone you’ve made, and with the other, blow a steady stream of air to cause the ball to levitate.

By gaining an understanding of Bernoulli’s principle, students can unlock the potential to design and create innovative solutions to real-world problems in a variety of fields.

Learn more: Bernoulli Principle for Kids

4. Air Pressure and Bottle

Get ready to witness a mind-blowing experiment that showcases the power of air pressure! By simply making a small hole in a plastic bottle and filling it with water, you can witness the incredible effects of air pressure at work.

5. Air-Powered Lift

Get ready to amaze your friends with this exciting experiment! With just a glass, a candle, and a plate, you can lift the plate using nothing but the power of air pressure.

6. Egg in a Bottle

With this exciting experiment using just a bottle, learn about the strength of air pressure! You may produce a variety of fascinating and unexpected effects by adjusting the air pressure inside the bottle.

7. Balloon Air Pressure Experiments

With this exciting experiment using just a bottle, learn about the strength of air pressure! You may produce a variety of fascinating and bizarre outcomes by regulating the air pressure inside the bottle.

Learn more: Balloon in a Bottle

8. Weather: Measuring Air Pressure

Get ready to become a meteorologist with this fascinating experiment that allows you to measure air pressure and predict changes in the weather!

By using a simple barometer made from a glass jar, a balloon, and a straw, you can measure changes in air pressure and use them to predict changes in the weather.\

9. Can Crush

The Can Crush experiment is a great demonstration of the effects of air pressure and it can be a fun and engaging activity for students.

10. DIY Model Lungs-Air Pressure Experiment

The balloon lung experiment is a fascinating demonstration that combines the principles of air pressure and the mechanics of the respiratory system.

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