Metre | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-25

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Metre


00:01:15 1 Spelling
00:01:52 2 Etymology
00:02:42 3 History of definition
00:04:34 3.1 Meridional definition
00:06:38 3.2 International prototype metre bar
00:08:17 3.3 Wavelength definition
00:09:06 3.4 Speed of light definition
00:13:41 3.5 Timeline
00:16:31 4 SI prefixed forms of metre
00:17:35 5 Equivalents in other units
00:19:29 6 See also



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SUMMARY
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The metre (British spelling and BIPM spelling) or meter (American spelling) (from the French unit mètre, from the Greek noun μέτρον, "measure") is the base unit of length in some metric systems, including the International System of Units (SI). The SI unit symbol is m. The metre is defined as the length of the path travelled by light in a vacuum in 1/299 792 458 second.The metre was originally defined in 1793 as one ten-millionth of the distance from the equator to the North Pole – as a result the Earth's circumference is approximately 40,000 km today. 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.
The imperial inch is defined as 0.0254 metres (2.54 centimetres or 25.4 millimetres). One metre is about ​3 3⁄8 inches longer than a yard, i.e. about ​39 3⁄8 inches.