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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).

Learn more about Einstein's mass-energy relation with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.

Relation may refer to:## See also

- Relation, a person to whom one is related, i.e. a family member (see also Kinship)
- Relation (mathematics), a generalization of arithmetic relations, such as "=" and "<", that occur in statements, such as "5 < 6" and "2 + 2 = 4". See also binary relation, triadic relation, relational algebra, theory of relations.
- In the relational model of databases, a set of tuples (also called rows), otherwise known as a table.
- Relation, in logic and philosophy, a property or predicate ranging over more than one argument. See also Logic of relatives, Relation of ideas, Relational theory, Relational philosophy.

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Last updated on Wednesday July 09, 2008 at 11:33:40 PDT (GMT -0700)

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This article is licensed under the GNU Free Documentation License.

Last updated on Wednesday July 09, 2008 at 11:33:40 PDT (GMT -0700)

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

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