Conceptual Physics (12th Edition)

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

Chapter 13 - Reading Check Questions (Comprehension): 18


$$Density = \frac{mass}{volume}$$ Density is controlled in a fish by controlling its volume. It expands or contracts an air sac in its body. In a submarine, density is controlled by varying its mass. It can take in or expel water from its ballast tanks.

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