Air Pressure Experiments (Science Experiments For Kids)

This post is a compilation of air pressure experiments for kids.

Air has weight which exerts force on everything at all times. The force exerted by air over a given area is called atmospheric pressure. It is the weight of atmosphere pressing down on earth’s surface. It is measured using a barometer. Air pressure decreases with increasing altitude.

This is because layers of air reduce with increase in height form the ground. You will notice your oxygen demand increases at high altitude. You may also experience discomfort when in an airplane. This is caused by changes in air pressure.

Air pressure can change when an object accelerates or wind blows. These changes provide cool science experiments.

These are various methods of demonstrating air pressure for kids.   Read More

How To Make a Volcano (Homemade Experiment For Kids)

Volcano Experiment for Kids

Making a chemical volcano is a very interesting experiment for kids. It helps in keeping them busy both indoors and outdoors. You will also have a chance of having fun while making them.

A volcanic eruption is a very captivating geographical phenomena. Making a chemical volcano is an ideal science project that allows kids to learn about chemistry and formation of volcanoes. There are different methods of making a volcano for a homemade experiment.

They utilize different methods and materials. The processes are simple and require simple materials which are mostly available in your home.

Below are the most safe, reliable and effective methods of making a homemade volcano using inexpensive household materials.


How to Make a Homemade Volcano 

Baking Soda and Vinegar Volcano

Baking soda and vinegar can be used in a kid’s science experiment to simulate a real volcanic eruption. The chemical process involves an acid-base reaction which produces water and carbon (iv) oxide gas.

Baking soda is referred to as sodium bicarbonate whereas vinegar is acetic acid. These chemicals are safe to use among young scientists.


1. baking soda,

2. vinegar,

3. 3 cups of flour,

4. 1 cup of salt,

5. 1 cup of water,

6. a pan,

7. gel food coloring,

8. 2 table spoons of cooking oil,

9. an empty drinking bottle

10. a dish washing detergent.


1. The experiment starts by mixing flour, salt, water and cooking oil together.

2. Add a few drops of coloring to make the volcano colored.

3. Take the bottle and fill it with water.

4. Add two table spoons of baking soda and a little dish washing detergent.

5. Now, set the drinking bottle on the center of the pan.

6. Proceed by shaping the dough around the bottle to make a volcano.

7. Smear some food coloring on the sides of your volcano to be picked up when the volcano erupts.

8. Finally, pour some vinegar into the bottle to produce an eruption.

9. Repeated eruptions are achieved by adding more baking soda and vinegar.

Mentos and Diet Soda Volcano

This experiment is similar to the baking soda volcanoes but the eruption is more powerful.

The experiment is messy since the jets of baking soda are expected to fly over a greater height. This experiment is best carried out outdoors or in the bathroom. However, it is non-toxic making it ideal for kids.


1. a roll of mentos candies,

2. an index card,

3. a test tub or a sheet of paper,

4. 2-litre bottle of diet soda and

5. a clean-up mop.


1. Start by stacking the candies in a test tube into a neat column with minimal space between them.

2. You can opt to roll a sheet of paper into a tube widely enough. The candies should have a chalky consistency .They should be enough to barely fit the mouth of the bottle.

3. Carefully, place the index card over the opening of the test tube or end of the paper tube to hold the candies.

4. Now, invert the test tube.

5. Finally, open the bottle of diet soda for the eruption to occur. This process happens very quickly.

Ketchup and Baking Soda Volcano

The volcano is produced by a chemical reaction between the acetic acid in ketchup and sodium bicarbonate or baking soda. This acid-base reaction produces carbon (iv) oxide and water.

The gas bubbles expand and rise through the water. Eventually, the ketchup is bubbled out to form a colored volcano.


1.  a small container,

2. ketchup,

3. molded clay,

4. baking soda,

5. dish washing soap and water.


1. The experiment starts with mixing the dish washing detergent, ketchup and water.

2. These are swirled together followed by addition of baking soda.

This volcanic eruption takes place slowly and steady. It is therefore ideal for a longer-lasting volcano.



Yeast and Peroxide Volcano

This volcano is easier to make.

The materials needed are:

1. hydrogen peroxide,

2. a quick rising yeast,

3. measuring cups,

4. a small bottle

5.  a paper or clay cone.


1. Model the volcano shape around the bottle using the paper cone or clay.

2. Take your hydrogen peroxide and pour it in the bottle.

3. Now, add the quick rise yeast to the bottle.

4. Activate the chemical reaction by stirring the yeast or swirling it around the bottle.

5. Rest the bottle as you watch the volcanic eruption.

These homemade experiments are easy to set up and require inexpensive materials. They produce different types of volcanoes in terms of time and power of eruption.

The steps are simple and the results can be reproduced. The ingredients are non-toxic thus ideal for kids` science projects.

How To Make Invisible Ink (3 Different Methods).

How do you make invisible ink, and most importantly, how does invisible ink work? This cool science experiment would show you how to make invisible ink using three different methods.

The three methods are as follows:

  • Making Invisible Ink using Lemon Juice.
  • Making Invisible Ink Using Baking Soda
  • Making Invisible Ink using Corn starch.


For the purpose of this experiment, you would need the following materials.

  1. Lemon Fruit
  2. A small bowl
  3. A Knife
  4. White Paper
  5. Cotton Bud
  6. Light Bulb


(a). Cut the lemon fruit into half and squeeze the juice from the fruit into a bowl.

(b). Mix the lemon juice with small quantity of water. Preferably in equal proportion with the juice.

(c). Dip the cotton bud into the lemon juice and use the cotton bud to write your secret message on the white paper

(d). Allow the white paper to dry.

(e). After few minutes, bring the paper close to the light bulb, leave it exposed to the heat from the bulb for some minutes.


The paper would usually look blank as if nothing is written on it, until you expose it to some form of it. Then the message would gradually begin to appear in brown color.


Lemon juice when oxidized can easily turn brown. This is exactly what happens when you expose the white paper to heat from light bulb.


This is another method of making an invisible ink for writing on a paper.


  1. A bowl
  2. Baking Soda
  3. Water
  4. Cotton bud
  5. White Paper
  6. Light bulb


(a). Mix equal amount of baking soda and water in the bowl

(b). Use the cotton bud to write your secret message on the white paper

(c). Allow the paper to dry appropriately.

(d). When you’re ready to read your message, expose paper to heat from light bulb.


Materials Needed:

  1. Small pot or pan
  2. Corn starch
  3. Water
  4. Iodine
  5. White Paper
  6. Cotton bud


(a). Mix A table spoon of Water and Starch, then boil to dissolve the starch completely.

(b). Use the cotton bud to write on the white paper, using the cotton bud as pen

(c). Allow the starch ink to dry on the paper.

(d). Make another solution of iodine and water (Mixing a table spoon of each together)

(e). Use another cotton bud to brush the iodine solution over the paper to reveal your secret message.


Cool? Yeah! Now you see that magic pen is not only in harry potter. You can make yours too!

How To Make Glowing Water

This article would show you how to make glowing water and various fun stuffs you can do with glowing water.

There are four (4) ways one making a glowing light, of the four methods; three of them would render the water undrinkable.

How To Make Glowing Water Using Highlighter:

It’s important to take note that glowing water made using this method is not drinkable and should be disposed when you’re done having fun with it.

Materials Needed:

  • Highlighter
  • Scissors (You can use a pliers or a knife as well)
  • A glass jar filled with water. (The higher the volume of water, the lower the luminescence)
  • UV light (Also called Black light)

Read More

How To Make a Tornado In a Bottle.

Want to learn how to make a tornado in a bottle? Follow this guide step by step and you would make your own tornado.

Materials Needed For Making Bottle Tornado.

A bottle

Dish Soap

Glitters (Optional)



  1. Fill the bottle with water (About halfway full)
  2. Add about two drops of dish soap
  3. Add some glitters
  4. Cover the bottle to with the bottle cap.
  5. Turn the bottle over so that the top faces down.
  6. Spin the bottle in a loose circular motion

After spinning for few seconds you should begin to see water whirling in the center of the bottle; giving rise to a mini volcano in the bottle. Although the volcano you just made isn’t as huge as the ones you see on weather stations. The aim of this fun science experiment is to show kids what a tornado looks like and hopefully teach kids some science lessons. So let’s get down to the science lesson part.

Read More

How To Make a Parachute

Want to learn how to make a parachute? You’re in the right place! Read on 😉

Parachutes are designed to aid free fall. The major function of a parachute is to reduce the speed at which an object falls to the ground as a result of gravity pull. Parachutes are used for safety and recreational activities.

If you’d like to make a parachute, this article would show you how to make a parachute, it would also show you the working principle behind a parachute and some other important tips on parachute generally. Read More

Egg in vinegar experiment

Introduction To Egg and Vinegar Experiment:

The egg in vinegar experiment is a classic experiment used in removing the egg shell from an egg. I once wrote a post that compiled various egg experiments for kids, you might want to check it out and see all sort of things you can do with an egg.

Most of the egg experiment revolves around the use of vinegar, talk of the egg osmosis lab, the bouncy egg and glowing egg; all of them requires the use of vinegar at one point of the other.

I have decided to make a post about the egg in vinegar experiment, what’s so special about vinegar anyway? and how does it react with egg to produce it’s result. Why does vinegar have such effect on egg?

Read More

How To Separate Egg Whites

How to separate egg whites the proper way.

If for some reasons, you’d like to separate egg whites from the yolk, here is the best method of doing it without getting your hand messy.

how to separate egg whites

How To Separate Egg Whites Using Plastic Bottle.

  1. Crack the egg gently into a plate. Make sure the yolk is intact.
  2. Get an empty plastic bottle.
  3. Squeeze the empty bottle so as to push away the air inside the bottle.
  4. Place the mouth of the empty bottle on the egg yolk inside the plate
  5. Release the bottle in an attempt to allow air to flow into the bottle.

That’s the simplest way of separating egg whites from the yolk.

If for some reasons you don’t want to use the method described above; let let’s explore three other methods, and you can choose the most appropriate one for yourself.

Check out more egg and bottle trick

Separate Egg Whites Using Your Hand.

This method is a bit old school and messy, but it would get you the desired result. Since you choose not to use the bottle method; let’s explore the method of separating egg whites using you hand.

  1. Get two plates ready. One for the egg whites and the other for the yolk.
  2. Wash you two hands thoroughly.
  3. Fold one of your palm to form a sieve.
  4. Once the egg is cracked, pour the content (both yolk and whites) on your folded palm.
  5. Gently allow the passage of the egg white through the space between your fingers into one of the bowl.
  6. Once the egg whites is full separated, pour the yolk into the second bowl.

Messy huh?

Of course there are other methods of separating egg whites from the yolk; another method is the use of egg separator.

How To Separate Egg Whites Using Egg Separator.

This method is close to perfect; I would have called it perfect; except that it would cost you about $2 to get an egg separator on amazon. Other than that; the method is as good as the bottle method.

  1. Crack the egg into the egg separator
  2. Shake the separator until the egg whites passes through the sieve into the plate placed beneath.

How to Separate Egg Whites Using Other Kitchen Tools

If you choose not to use any of the methods suggested above; then you can use any other kitchen tools.

The most important feature of the tools is that; it must be able to hold the egg yolk while the albumen; egg whites passes through it.

Example of such tool is the slotted spoon and of course the common funnels that we use in the kitchen.

The funnel is another good option; however you should be careful while shaking it to preventing mixing the yolk with the egg whites which would render the purpose of the separation meaningless.

Others Methods Of Separating Egg Whites.

There is another method that is pretty common; provided you’re separating the egg whites of a single egg and you’re in a hurry and don’t have the luxury of time to get the required tools for the separation.

If you find yourself in such situation; here is a quick way (not the best though) of separating egg whites from it’s yolk.

  1. Mark the egg along the middle; usually this is the region with the broadest diameter. It’s where the egg looks really big.
  2. Make a smart crack along that line and carefully remove one-half of the shell while you pour it’s content into the other shell. Watch out for the yolk!
  3. Now, carefully pour the egg whites from one-half shell to the other,

This method is not the fastest; but it might come handy in case you can lay your hands on the right tools.

Science Of How To Separate Egg Whites

It’s gradually becoming an habit for me; I won’t share a trick/experiment/tips with you without talking about the science behind; after all that’s where the real lesson lies.

Eggs, just like every other item on planet earth; gravity would always have it’s effect on it.

In an egg there are two major contents; we have the egg yolk and the egg whites. But there is a slight different between the two.

The egg white is more liquid in nature compared to the egg yolk which is a little bit solidify (a little bit!).

What this means in the real sense of it is that; the molecule that makes up the egg whites have more freedom (they can move freely and faster) compared to those of the egg yolk (which have lesser speed because they’re closely binded together; being semi solid)

So when you try to pour egg white along the force of gravity; they move faster than egg yolk because of the free movement of the molecules that constitute them.

Check out how to test if an egg is good or bad.

How To Get an Egg In a Bottle

How to get an egg in a bottle?

Seems impossible right? It’s possible! And this science experiment would show you how to get an egg in a bottle without breaking the egg or the bottle.


This is obvious but I would still state it anyway. The aim of the experiment is to get a hard boiled peeled egg into a bottle.

While doing this; the experiment also aims to demonstrate the relationship between temperature and pressure.

Materials Needed:

  • Hard boiled egg (Make sure it is peeled properly)
  • A Glass bottle (Make sure the mouth is big enough to partially accommodate the base of the egg.)
  • Matches
  • Sheet of Paper (Cut it into sizes small enough to enter the bottle)

how to get an egg in a bottle

How to get an egg in a bottle: Procedure

  1. Light up the sheet of paper and carefully (but quickly) drop it inside the glass bottle.
  2. Carefully place the hard boiled egg on the mouth of the glass bottle.
  3. Allow the burning sheet of paper to die off itself.
  4. Watch as the egg squeeze it’s way into the bottle.

That wasn’t hard was it? Now let’s look at the science behind the experiment.

Egg in a bottle explanation.

How did the egg on the bottle end up inside the bottle? What’s the science behind the experiment?

Let’s analyze the experiment scientifically and see for ourselves.

Why glass bottle?

Glass bottle can absorb heat and not burn out compared to other materials. So it’s important that you use a glass bottle.

The bottle would usually contain some air when you dropped the burning sheet of paper into it. This air molecule would eventually gain more kinetic energy and as a result they would be able to move more freely.

The egg placed on the bottle mouth would allow small fraction of the heated air to escape from the bottle. The escape of some of the air molecule will result into lesser air in the bottle right?

So when the burning sheet of paper dies off… There would be a need for air to enter the bottle and fill up the partial vacuum inside the bottle.

For this to occur, the incoming air from the atmosphere, would exert huge amount of pressure on the egg blocking it’s passage into the bottle and as a result; it would forcefully push the egg inside the bottle.

That’s the science of how to get an egg into a bottle…. 😉

Getting out the egg in the bottle:

Now that we’ve completed the experiment; it’s time to get our precious egg out of the bottle. How do we do that without breaking the bottle?

This can be done using the same principle that we used in getting the egg into the bottle initially.

All you have to do in increase the volume of atmospheric air inside the bottle by placing your mouth over the top of the bottle and forcefully blow some air into the bottle.

You can now carefully turn the bottle upside down to remove the egg gently.

Other Methods:

Since the major aim of the experiment is to increase the kinetic energy of the air particles inside the bottle by heating it up so that they can escape; then there are other means of achieving that without the use of sheet of paper and lighter.

You can also get an egg in a bottle using the hot water method, and here is how it’s done.

  1. Get yourself a glass bottle and boil a clean water to 100 Degree celcius
  2. Carefully pour the water into the glass bottle; about half way through
  3. The place the hard boiled egg (with the shell removed) on the bottle top
  4. Watch as the egg squeezes it’s way into the bottle.

You should be careful when dealing with hot water; adult supervision is very important here.

When you’re about to remove the egg, the first step is to pour out the hot water before blowing some air into the bottle.

Remember you’re dealing with hot water and it WOULD hurt your skin if it touches it.

Video: How to get an Egg In A Bottle Using Hot Water.



Were you able to pull the experiment off? Did you face any challenges while completing the experiment? If you’ve got other interest science experiment as regards egg, air and pressure, feel free to make use of the comment box.

Just before you move on; check out the cool egg float test experiment.

Egg Science Experiments: Bouncy Egg, Floating Egg and Others.

Egg science experiments:

Science is fun!  Here is a compilation of science experiments with eggs. All experiments listed in this article are fun to do; and they all have one thing in common; eggs! The experiments are designed to show you various aspect of science using the common kitchen egg as a specimen.

Naked and Bouncy Egg Experiment

What happens when you put an egg in vinegar? Read More