HERE'S HOW
Securely place deflated balloons over the tops of two empty soda bottles. Put the bottles in two plastic bowls or pails. Fill one container with hot water and one with ice cubes. The balloon on the bottle in hot water should begin to inflate.
WHY?
The hot water heats the air in one bottle and the ice cools the air in the other. When air gets warm, it expands and rise, which inflates the balloon. Cool air contracts, causing the other balloon to shrink.
BOTTLED AIR »
Illustration by David Bamundo
Text by Julie Vosburgh Agnone
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