Answer
It works by evaporative cooling.
Work Step by Step
The water seeps through the bag and evaporates because it absorbs energy from its surroundings – i.e., from the bag. This cools the bag and its contents.
University Physics with Modern Physics (14th Edition)
by Young, Hugh D.; Freedman, Roger A.
Published by
Pearson
ISBN 10:
0321973615
ISBN 13:
978-0-32197-361-0
Chapter 17 - Temperature and Heat - Problems - Discussion Questions - Page 573: Q17.14
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