A Metre is defined as the base unit of length which is one of the fundamental quantities, as defined by the International System of Units. There were several definitions that were awarded to this fundamental unit over time. In 1793, a meter was defined as one ten-millionth of the distance from the equator to the North Pole. In 1960, one metre was defined in as the distance travelled by certain number of wavelengths of a certain emission line of krypton-86. In 1983, it was defined as “the total length travelled by light in vacuum in 1/299792458th of a second. This is the definition that accurately holds true even today.

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