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International decimal system of weights and measures, based on the metre (m) for length and the kilogram (kg) for mass, originally adopted in France in 1795. All other metric units were derived from the metre, including the gram (g) for weight (1 cc of water at its maximum density) and the litre (l, or L) for capacity (0.001 cu m). In the 20th century, the metric system became the basis for the International System of Units, which is now used officially almost worldwide.

Learn more about metric system with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.

In mathematics, a set of objects equipped with a concept of distance. The objects can be thought of as points in space, with the distance between points given by a distance formula, such that: (1) the distance from point A to point B is zero if and only if A and B are identical, (2) the distance from A to B is the same as from B to A, and (3) the distance from A to B plus that from B to C is greater than or equal to the distance from A to C (the triangle inequality). Two- and three-dimensional Euclidean spaces are metric spaces, as are inner product spaces, vector spaces, and certain topological spaces (*see* topology).

Learn more about metric space with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.

Metric may refer to:

- Metric system, a system of units developed in France in the 18th century
- International System of Units, or Système International (SI), the international system of units since 1960, a subset of the former
- Metrics, a system of parameters that are measured
- Metrics (networking), set of properties of a communication path
- Metre (music), a measurement of beats in music
- Metre (poetry), the linguistic sound patterns of a verse
- Metric (band), a Canadian indie rock band
- In mathematics:
- Metric (mathematics), an abstraction of the notion of distance in a metric space
- Norm (mathematics), an abstraction of the notion of size in a normed vector space
- Metric tensor, a symmetric tensor of rank 2 used to measure distance
- Software metrics, a measure of some property of a piece of software or its specifications

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Last updated on Sunday September 14, 2008 at 14:20:25 PDT (GMT -0700)

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This article is licensed under the GNU Free Documentation License.

Last updated on Sunday September 14, 2008 at 14:20:25 PDT (GMT -0700)

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

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