Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 17 - Think and Explain - Page 334-335: 66

Answer

The lower air pressure on the surface of the liquid lowers the energy threshold for a water molecule to escape, so the water boils at a lower temperature.
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