Conceptual Physics (12th Edition)

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

Chapter 16 - Think and Explain: 60

Answer

More molecules are in the cooler room.

Work Step by Step

Hot air is less dense than cold air, so for the same volume, the roomful of cold air has more mass, i.e., more molecules.
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