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Egg in the bottle experiment

You will need:

  • 1 x 1 litre glass bottle. 
  • The mouth of the bottle needs to be just a little bit smaller than the size of the egg you’re using.
  • 1 x Kettle, filled with tap water.
  • 1 x Hard boiled egg
  • 1 x Oven mitten
  • Safety glasses



  1. Boil the kettle
  2. Fill the glass bottle with boiling water, and let it sit for 20 seconds.

    pouring hot water
  3. Put the oven mitt on to protect your hand, and pour the water out of the bottle and back into the kettle. Wait another 15 seconds
  4. Place the hard boiled egg on top of the mouth of the bottle.

    egg in the bottle experiment
  5. Wait and watch as the bottle cools... your egg should be pushed into the bottle!
  6. You can speed up the process by blowing air on the bottle. Watch the egg get go into the bottle!

    egg being pushed into a bottle experiment

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materials for egg in the bottle experiment
Materials needed for the egg in the bottle experiment
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What's going on?

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 we 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 we 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 andcan 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)
Other air pressure based science experiments
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