Перевод и анализ слов искусственным интеллектом ChatGPT
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- этимология
Что (кто) такое metre - определение
![Triangulation near [[New York City]], 1817](https://commons.wikimedia.org/wiki/Special:FilePath/HasslerCollection 001.jpg?width=200 "Triangulation near [[New York City]], 1817")
![The Meridian room of the [[Paris Observatory]] (or Cassini room): the [[Paris meridian]] is drawn on the ground.](https://commons.wikimedia.org/wiki/Special:FilePath/Obs-Paris-meridienne.jpg?width=200 "The Meridian room of the [[Paris Observatory]] (or Cassini room): the [[Paris meridian]] is drawn on the ground.")
![The [[Paris]] [[Panthéon]]](https://commons.wikimedia.org/wiki/Special:FilePath/Panthéon de Paris, 16 January 2016.jpg?width=200 "The [[Paris]] [[Panthéon]]")
![[[Gravimeter]] with variant of Repsold-Bessel pendulum](https://commons.wikimedia.org/wiki/Special:FilePath/Repsold.jpg?width=200 "[[Gravimeter]] with variant of Repsold-Bessel pendulum")
![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](https://commons.wikimedia.org/wiki/Special:FilePath/US National Length Meter.JPG?width=200 "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")
Википедия
The metre (or meter in American spelling; symbol: m) is the base unit of length in the International System of Units (SI).
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. In 1799, the metre 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.
The current definition was adopted in 1983 and modified slightly in 2002 to clarify that the metre is a measure of proper length. From 1983 until 2019, the metre was formally defined as the length of the path travelled by light in a vacuum in 1/299792458 of a second. After the 2019 redefinition of the SI base units, this definition was rephrased to include the definition of a second in terms of the caesium frequency ΔνCs.
