University Physics with Modern Physics (14th Edition)

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

Chapter 20 - The Second Law of Thermodynamics - Problems - Discussion Questions - Page 676: Q20.18

Answer

Free expansion is not a reversible process.

Work Step by Step

Equation 20.19 applies only to reversible processes, but free expansion is not a reversible process. One could take a movie of the free expansion process and run it backwards. It would look most unusual.
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