Video encyclopedia

30/03/1791 French scientists defined the length of a meter


Why's a Meter a Meter?


Who Invented the Meter?


Convert meters to feet-Meters to inches

The meter is the base unit of length in the International System of Units. The SI unit symbol is m. The meter was originally defined in 1793 as one 10-millionth of the distance from the equator to the North Pole – as a result the Earth's circumference is approximately 40,000 km today.
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    • Essentials 

    • Etymology 

    • History of definition 

    • SI prefixed forms of metre 

    • Equivalents in other units