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Length | |
---|---|

Common symbols | l |

SI unit | metre (m) |

Other units | see unit of length |

Extensive? | yes |

Dimension | L |

**Length** is a measure of distance. In the International System of Quantities, length is a quantity with dimension distance. In most systems of measurement a base unit for length is chosen, from which all other units are derived. In the International System of Units (SI) system the base unit for length is the metre.

Length is commonly understood to mean the most extended dimension of a fixed object.^{[1]} However, this is not always the case and may depend on the position the object is in.

Various terms for the length of a fixed object are used, and these include height, which is vertical length or vertical extent, and **width**, **breadth** or **depth**. Height is used when there is a base from which vertical measurements can be taken. Width or breadth usually refer to a shorter dimension when length is the longest one. Depth is used for the third dimension of a three dimensional object.^{[2]}

Length is the measure of one spatial dimension, whereas area is a measure of two dimensions (length squared) and volume is a measure of three dimensions (length cubed).

**^**"WordNet Search - 3.1".*wordnetweb.princeton.edu*. Archived from the original on 25 September 2016. Retrieved 15 March 2020.**^**"Measurement: Length, width, height, depth | Think Math!".*thinkmath.edc.org*. Archived from the original on 24 February 2020. Retrieved 15 March 2020.