Conceptual Physics (12th Edition)

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

Chapter 14 - Think and Discuss - Page 281: 95

Answer

The cabin is pressurized while in flight, but the pressure is lower than one atmosphere. The bag was sealed (presumably) at sea level. The pressure inside is greater than the cabin pressure, and it puffs up.

Work Step by Step

This is explained on page 272, and in Figure 14.15.
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