Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 14 - Heat - Questions: 23



Work Step by Step

An ordinary fan does not cool the air in 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 + room gets warmer. Furthermore, as the fan moves hot, humid air away from you and lets cooler, drier air move in, this also assists in evaporation.
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