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 610: Q18.26

Answer

See explanation.

Work Step by Step

When the atmospheric pressure above the water is reduced sufficiently, it approaches the vapor pressure of room temperature water. The water begins to boil, meaning that some of the fastest water molecules at the surface have sufficient energy to escape. These are among the fastest-moving molecules, so this process cools the water.
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