University Physics with Modern Physics (14th Edition)

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

Chapter 18 - Thermal Properties of Matter - Problems - Discussion Questions - Page 609: Q18.1


The statement is consistent.

Work Step by Step

The statement about so-called “state variables” applies to a substance in one state, such as a liquid or a gas. When the substance is undergoing a first-order phase transition, as when a liquid evaporates to a gas, it is between 2 states and the system volume can change without changing the temperature or pressure. In other words, there is no reason to expect one equation of state to hold for a system containing material in 2 states.
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