Conceptual Physics (12th Edition)

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

Chapter 18 - Think and Explain - Page 352-353: 63


A fan does not cool the room; in fact, the motor gives off heat which raises the air temperature slightly in the entire room. 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, though overall, the system of "you and the room" gets warmer.
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