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Relationship between mass (*math.m*) and energy (*math.E*) in Albert Einstein's special theory of relativity, expressed *math.E* = *math.m**math.c*^{2}, where *math.c* equals 186,000 mi/second (300,000 km/second), the speed of light. Whereas mass and energy were viewed as distinct in earlier physical theories, in special relativity a body's mass can be converted into energy in accordance with Einstein's formula. Such a release of energy decreases the body's mass (*see* conservation law).

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.

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Last updated on Saturday September 15, 2007 at 03:13:58 PDT (GMT -0700)

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This article is licensed under the GNU Free Documentation License.

Last updated on Saturday September 15, 2007 at 03:13:58 PDT (GMT -0700)

View this article at Wikipedia.org - Edit this article at Wikipedia.org - Donate to the Wikimedia Foundation

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