Essential University Physics: Volume 1 (4th Edition)

Published by Pearson
ISBN 10: 0-134-98855-8
ISBN 13: 978-0-13498-855-9

Chapter 18 - Section 18.2 - Thermodynamic Processes - Conceptual Example - Page 335: 18.1


They are both right.

Work Step by Step

Looking at these two equations, it seems like they contradict each other, but this is actually a misunderstanding of when each is used. The ideal gas law is used when T can be changing. However, for the other equation, T on the other side of the equation is constant, so the value on the right side has to be constant.
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