## Conceptual Physics (12th Edition)

Published by Addison-Wesley

# Chapter 13 - Reading Check Questions (Comprehension): 18

#### Answer

$$Density = \frac{mass}{volume}$$ 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.

#### Work Step by Step

These statements are on page 252.

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