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Turning the Air Upside Down: Warm Air is Less Dense than Cool Air

Integrated Teaching and Learning Program, College of Engineering, University of Colorado at Boulder

Learners cover a bottle with a balloon. When they immerse the bottle in warm water, the balloon inflates. When they immerse the bottle in a bowl of ice, the balloon deflates.

1 cent - $1 per group Ages 8 - 14 5 to 10 minutes