Conceptual Physics (12th Edition)

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

Chapter 17 - Think and Explain: 49

Answer

When you blow on hot soup, you move away the moist vapor above the soup that inhibits evaporation. The moist air cannot hold as much additional vapor as dry air. By blowing, you increase net evaporation. More evaporation means cooler soup, because it is the higher-energy soup molecules that leave first, lowering the average temperature of the soup that is left behind.
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