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[[File:5 metres (8349446738) (2).jpg|thumb|right|This giraffe is nearly five metres tall.]]
[[File:5 metres (8349446738) (2).jpg|thumb|right|This giraffe is nearly five metres tall.]]
A '''metre''' (US spelling, ''meter'') is the basic [[units of measurement|unit]] of [[length]] in the [[SI]] measurement system. The [[symbol]] for the metre is '''m'''. The first meaning (in the [[French Revolution]]) was one ten-millionth of the [[distance]] between the [[Earth]]'s [[equator]] and the [[North Pole]] along the [[Paris]] [[meridian]].<ref name=NIST>{{cite web|url=http://physics.nist.gov/cuu/Units/meter.html|title=Historical context of the SI|publisher=US Government - National Institute of Standards and Technology}}</ref> The metre is now defined as the [[distance]] [[light]] travels in a [[vacuum]] in 1/299,792,458 of a [[second]].<ref name=NIST/>
A '''metre''' (US spelling, ''meter'') is the basic [[units of measurement|unit]] of [[length]] in the [[SI]] measurement system. The [[symbol]] for the metre is '''m'''. The first meaning (in the [[French Revolution]]) was one ten-millionth of the [[distance]] between the [[Earth]]'s [[equator]] and the [[North Pole]] along the [[Paris]] [[meridian]].<ref name=NIST>{{cite web|url=http://physics.nist.gov/cuu/Units/meter.html|title=Historical context of the SI|publisher=US Government - National Institute of Standards and Technology}}</ref> The metre is now defined as the [[distance]] [[light]] travels in a [[vacuum]] in 1/299,792,458 of a [[second]].<ref name=NIST/>
In the [[Imperial unit|imperial]] system of measurement, one yard is 0.9144 metres (after international agreement in 1959), so a metre is very close to 39.37 [[inch]]es: about 3.281 [[Foot (unit of length)|feet]], or 1.0936 [[US yard|yards]].
In the [[Imperial unit|imperial]] system of measurement, one yard is 0.9144 metres (after international agreement in 1959), so a metre is very near to 39.37 [[inch]]es: about 3.281 [[Foot (unit of length)|feet]], or 1.0936 [[US yard|yards]].
[[File:Platinum-Iridium meter bar.jpg|thumb|right|The bar (made of [[platinum]] and [[iridium]]) that defined the length of a metre until 1960.]]
[[File:Platinum-Iridium meter bar.jpg|thumb|right|The bar (made of [[platinum]] and [[iridium]]) that defined the length of a metre until 1960.]]
== Units multiples ==
==Units multiples==
* 0.000 000 000 000 000 000 000 001 Ym (yotametre) = 1 m
* 0.000 000 000 000 000 000 000 001 Ym (yotametre) = 1 m
* 0.000 000 000 000 000 000 001 Zm (zetametre) = 1 m
* 0.000 000 000 000 000 000 001 Zm (zetametre) = 1 m
* 1 000 000 000 000 000 000 000 zm (zeptometres) = 1 m
* 1 000 000 000 000 000 000 000 zm (zeptometres) = 1 m
* 1 000 000 000 000 000 000 000 000 ym (yoctometres) = 1 m
* 1 000 000 000 000 000 000 000 000 ym (yoctometres) = 1 m
==Related pages==
== Metre Media ==
<gallery widths='160px' heights='100%' mode='traditional' caption=''>
File:Obs-Paris-meridienne.jpg|The Meridian room of the [[Paris Observatory]] (or Cassini room): the [[Paris meridian]] is drawn on the ground.
File:Panthéon de Paris, 16 January 2016.jpg|Panthéon de Paris, 16 January 2016
File:HasslerCollection 001.jpg|Triangulation near [[New York City]], 1817
File:Appareil Ibáñez.jpg|Mesure d'un base géodésique dans le Grand-Marais en Suisse avec l'appareil conçu par Carlos Ibáñez e Ibáñez de Ibero et réalisé à Paris par les frères Léon et Émile Brunner. Cette règle géodésique est calibrée sur le mètre.
File:Repsold.jpg|Péndulo de Barraquer.
File:Metre alloy.jpg|Preparing the first metre-alloy in May 1874, at the Conservatoire des Arts et Métiers, Paris
File:US National Length Meter.JPG|Closeup of National Prototype Metre Bar No. 27, made in 1889 by the International Bureau of Weights and Measures (BIPM) and given to the United States, which served as the standard for defining all units of length in the US from 1893 to 1960
</gallery>
== Related pages ==
*[[Metre Convention]]
*[[Metre Convention]]
==References==
== References ==
{{reflist}}https://www.youtube.com/channel/UCLjFezysfbVZFZ_jeLB0iHg<nowiki/>{{SI units}}
{{reflist}}https://www.youtube.com/channel/UCLjFezysfbVZFZ_jeLB0iHg<nowiki/>{{SI units}}