define standard metre?
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The Standard meter is the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second.
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The metre is defined as the length of the path travelled by monochromatic 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
The French originated the meter in the 1790s as one/ten-millionth of the distance from the equator to the north pole along a meridian through Paris. It is realistically represented by the distance between two marks on an iron bar kept in Paris.
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