HOW MUCH IS A METER ?

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In A.D. 1120, the king of England decreed that in his country, the yard will be used as the unit of length. It was the distance from the tip of the king's nose to the end of his outstretched arm.

The original standard adopted by France was called a foot. It was equal to the royal foot of the king. In 1799, the kings foot was replaced by "meter".

  • Then it was defined as one ten millionth distance from the equator to the north pole along a longitudinal line that passes through Paris.
  • In 1889, 1 meter was defined as the distance between two lines on a specific platinum-iridium bar stored under controlled conditions.
  • In 1960, meter was redefined as 1,650,763.73 wavelengths of a particular orange-red light emitted by atoms of Krypton-86 in a gas discharge tube.
1 meter = 100 cm
The meter was redefined again in 1983, this time as the distance which light travel in a vacuum in 1/299,792,458 seconds. This remains the current definition.

Note that in all these re-definitions, the length of the meter was always taken as close as possible to the value fixed in 1799.

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