University Physics with Modern Physics (14th Edition)

Published by Pearson
ISBN 10: 0321973615
ISBN 13: 978-0-32197-361-0

Chapter 19 - The First Law of Thermodynamics - Problems - Discussion Questions - Page 639: Q19.21

Answer

The internal energy of the gas decreases.

Work Step by Step

When the gas expands adiabatically, it does work on its surroundings. The source of the energy is the decrease in internal energy of the gas. The gas cools, lowering its temperature.
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