Metre
Metre
Metre (pronunciation: /ˈmiːtər/; etymology: from the Greek metron, "measure") is the base unit of length in the International System of Units (SI). It is defined as the length of the path travelled by light in a vacuum in 1/299,792,458 of a second.
History
The metre was originally defined in 1793 as one ten-millionth of the distance from the equator to the North Pole. In 1889, it was redefined in terms of a prototype metre bar (the actual bar used is kept in Paris). 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.
Usage
The metre is used worldwide in many applications such as measuring distance, height, length, width, etc. It is also used in the fields of physics, engineering, and technology.
Related Terms
- Kilometre: A unit of length in the metric system, equal to one thousand metres.
- Centimetre: A unit of length in the metric system, equal to one hundredth of a metre.
- Millimetre: A unit of length in the metric system, equal to one thousandth of a metre.
- Micrometre: A unit of length in the metric system, equal to one millionth of a metre.
- Nanometre: A unit of length in the metric system, equal to one billionth of a metre.
External links
- Medical encyclopedia article on Metre
- Wikipedia's article - Metre
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