Convert Metre [m] to...
|1 m in ...||... is equal to ...|
|SI units||1000 mm
|Imperial/US unit(s)||1.0936 yd
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|Astronomical Unit [AE]|
The metre, or meter (American spelling), is the base unit of length in the International System of Units (SI). The SI unit symbol is m. The metre is defined as the distance travelled by light in a vacuum in 1/299792458 seconds.
The metre was originally defined in 1793 as one ten-millionth of the distance from the equator to the North Pole. In 1799, it was redefined in terms of a prototype metre bar (the actual bar used was changed in 1889). In 1960, the metre was redefined in terms of a certain number of wavelengths of a certain emission line of krypton-86. In 1983, the current definition was adopted.
In the 19th and 20th centuries, increasingly powerful microscopes and scientific measurement detected variation in these prototype yards which became significant as technology improved. In 1959, the United States, United Kingdom, Australia, New Zealand, and South Africa agreed to adopt the Canadian compromise value of 0.9144 meters per yard.
This article uses material from the Wikipedia article "Metre", which is released under the Creative Commons Attribution-Share-Alike License 3.0.