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Marvin and Milo

Explore physics the exciting way, by trying out a simple and fun experiment. This month, Electric Slime Don't forget to check back next month for the next edition...

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What you need

  1. a clear plastic bottle
  2. a pen
  3. a balloon (blow it up a few times beforehand)


  1. Make a hole in the bottom of the bottle with the pen.
  2. Push the balloon inside and stretch it over the mouth.
  3. Blow up the balloon.
  4. Notice air is coming out of the hole in the bottle.
  5. Cover the hole with your finger and stop blowing.

Results & explanation

The balloon stays inflated! As the balloon expanded, it pushed air out of the bottle. That made the pressure inside the bottle lower than the pressure inside the balloon, so it wasn't strong enough to squeeze the air out.

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