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How to Blow Up a Balloon with a Glass Bottle

Grade Levels: 3 - 6


Blow up a balloon without using your mouth or your hands.


  • Glass bottle. One with a short neck works best.
  • A medium-sized balloon with the neck of the balloon cut off just below the opening
  • A large bowl
  • Water


  1. Fill the glass bottle with warm-to-hot water. Let it sit for about 3 minutes so the bottle warms up.
  2. Pour cold water into the bowl until it's about 3/4 full.
  3. Pour the warm water out of the bottle.
  4. Stretch the balloon over the top of the bottle.
  5. 5. Put the bottle into the bowl of water and watch what happens!

The balloon should inflate inside the bottle.

Why it happened:

As the air in the bottle cooled, it contracted and took up less space in the bottle. Air from outside the bottle rushed in to fill the space and inflated the balloon.

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Provided by Factmonster.com.


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