## Conceptual Physics (12th Edition)

Published by Addison-Wesley

# Chapter 35 - Think and Explain: 83

#### Answer

$E = mc^{2}$ means that energy and mass are, in some sense, equivalent.

#### Work Step by Step

When something gains energy, it gains mass, and vice versa. When something loses energy, it loses mass, and vice versa. The $c^{2}$ is the proportionality constant that connects energy and mass.

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