What is a metre and when and where was it defined
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Answer:
Explanation:
Metre. ... The metre is defined as the length of the path travelled by light in a vacuum in 1299 792 458 of a second. The metre was originally defined in 1793 as one ten-millionth of the distance from the equator to the North Pole along a great circle, so the Earth's circumference is approximately 40000 km.
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Answer:
the fundamental unit of length in the metric system, equivalent to 39.37 U.S. inches, originally intended to be, and bng very nearly, equal to one ten-millionth of the distance from th equat to the p measured on a meridian: defined from 1889 to 1960 as the distance between two lines on a platinum-iridium preserved at the International Bureau of Weights and Measures near Paris; from 1960 to 1983 defined as 1,650,763.73 wavelengtof the orange-red radiation f krypton 86 under specified condions; and nowefined as 1/299,792,458 of the distance light travels in a vacuum in one second.