Information about Egg in the bottle experiment with Fizzics Education | Kids Science Experiments

Egg into a bottle trick

Egg into a bottle trick

Follow FizzicsEd 150 Science Experiments:

You will need:

One 1L glass bottle, the mouth of the bottle needs to be a little smaller than the size of the egg you are using

One Kettle, filled with tap water

One hard-boiled egg.

One oven mitten

Safety glasses

Adult help and supervision.

Egg Into a Bottle Trick Science Experiment - setup_materials
1 Egg Into a Bottle Trick Science Experiment - pouring boiling water into a glass bottle

Boil the kettle.

With the help of an adult, fill the glass bottle with boiling water, and let it sit for 20 seconds.

2

With the help of an adult. Put on the oven mitt and pour out of the bottle and back into the kettle.

3 Egg Into a Bottle Trick Science Experiment - waiting for 15 seconds

Wait for another 15 seconds.

4 Egg Into a Bottle Trick Science Experiment - egg on top of bottle(1)

Place the hard-boiled egg on top of the mouth of the bottle.

5 Egg Into a Bottle Trick Science Experiment - egg on top of glass bottle

Wait and watch as the bottle cools. Your egg should be pushed into the bottle.

6 Egg Into a Bottle Trick Science Experiment - final result

You can speed up the process by blowing air on the bottle.

Why Does This Happen?

When you heat up the glass bottle with the boiling water, and then remove the water, the glass stays very hot. This heats up the air inside the bottle. Hot air rises, so a lot of the air inside the bottle rushes out the top. This creates an area of low pressure inside the bottle.

When you cool down the bottle by blowing on it, the air that remained inside the bottle contracts, taking up less space, and reducing the air pressure inside the bottle even further.

Now you have what’s called a pressure differential, where the air pressure outside the bottle is higher than the air pressure inside it. Nature likes to exist in a more even state, and so the easiest solution is to put more air into the bottle until the pressure equalises. Of course, the egg is blocking the only entrance into the bottle, and so the air pushes it into the bottle in order to get access!
Further information

Air pressure is the force of molecules of air pushing against things and can be is a pretty powerful force. It’s responsible for a lot of the weather we see, including some of the wild weather that can cause damage to people and property. Humans also use the way air moves to power machines, and make our lives easier.

Australian Curriculum Links

Year 4 Science: Physical Sciences
Forces can be exerted by one object on another through direct contact or from a distance (ACSSU076)

Learn more!

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