Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 14 - Think and Discuss: 101

Answer

As the balloons rise, the atmospheric pressure outside decreases with altitude. The balloon that is free to expand will do so, can displace more air, and thus will experience more buoyant force than the fixed-size balloon.

Work Step by Step

This is discussed on page 271.
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