HERE'S HOW
Show an empty soda bottle to a friend and announce that although the bottle may look empty, you can prove that it's actually full. Then put a deflated balloon into the bottle as shown, stretching the open end of the balloon over the mouth of the bottle. Can your friend blow up the balloon while it's inside the bottle? No way!
WHY?
No matter how hard your friend blows, he or she won't be able to blow up the balloon while it is inside the bottle. This is because the bottle is already completely full—of air. Even though it's invisible, air takes up space.
FLUTTERS »
Illustration by David Bamundo
Text by Julie Vosburgh Agnone
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