Conceptual Physics (12th Edition)

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

Chapter 17 - Think and Explain: 53

Answer

A fan does not cool the room; in fact, the motor gives off heat which raises the air temperature slightly. However, the fan helps your sweat evaporate by circulating air. It is the higher-energy water molecules that leave first, lowering the average temperature of the liquid that is left behind. This cools you off.
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