This experiment illustrates that air really does take up space! You can’t inflate the balloon inside the bottle without the holes, because it’s already full of air. When you blow into the bottle with the holes, air is allowed to leak out making room for the balloon to inflate. With the intact bottle, you run into trouble because there’s nowhere for the air already inside the bottle to go when you attempt to inflate the balloon.

You’ll need to get two balloons, one tack, and two empty water bottles.

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4 Responses to “Sneaky Bottles”

  1. The higher pressure is inside the balloon, where you blew in all that extra air. Sometimes latex balloons can stick to themselves, closing off the nozzle even when it’s not tied. Try putting a little water on your finger and rub your finger just inside the balloon to make it unstick and try again. You can do it! 🙂

  2. Jennifer Bechtel says:

    After the balloon stays inflated, even though the neck is not tied….. where IS the higher pressure region?

  3. Linda Miller says:

    Thanks for these simple, yet informative, experiments. My children are looking forward to “teaching” (or should I say “tricking”) their friends with this experiment. 🙂 But I figure if they can teach it to their friends, then they understand it, right?

  4. Donna Horwitz says: