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Information About

Length




In general English usage, length (symbols: ''l'', ''L'') is one particular instance of extent, and width (or breadth), denoting a lateral extent along a dimension shorter than an object's length. In the physical sciences and engineering, the word "length" is typically used synonymously with "distance".

Length is the Metric of one Dimension of Space . The metric of ordinary three-dimensional space is Volume or (length)3. Length is commonly considered to be one of the Fundamental Unit s, meaning that it cannot be defined in terms of other dimensions. A set of units can be constructed where units of length can be derived from fundamental Physical Constant s — see Planck Units and Planck Length .

Colloquially length sometimes refers to Duration , especially when used in context of music.


UNITS OF LENGTH

Length is measured by a variety of Units . In scientific contexts, SI units are favored.

SI units of length

The SI Unit of length is the Metre (U.S. spelling: meter), from which can be derived:


Imperial and US customary units of length

The Imperial Unit s and US Customary Unit s of length are:


Astronomical units of length

Astronomy uses units of length that are much greater than those typically encountered:


Microscopic units of length

Various other applications require units of length which are very small:


SEE ALSO