Conceptual Physics (12th Edition)

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

Chapter 35 - Think and Explain - Page 684-685: 83


$E = mc^{2}$ 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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