Adler, Ronald J. Lockheed Palo Alto Research Laboratories, Palo Alto, California, and Physics Department, San Francisco State University, San Francisco, California.
- Newton's law
- Rest energy
- Links to Primary Literature
- Additional Readings
A constant intrinsic to a body which determines its inertial and energy-momentum properties. It is a fundamental concept of special relativity, and in particular it determines the internal energy content of a body. It is the same as the inertial mass of classical mechanics. According to the principle of equivalence, the basic physical principle of general relativity, the inertial mass of a body is also equal to its gravitational mass. See also: Classical mechanics; Gravitation; Relativistic mechanics; Relativity
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