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Metric (S.I.)
1.61 kmKilometre
1,609.35 mMetre
16,093.47 dmDecimetre
160,934.73 cmCentimetre
1.609e+6 mmMillimetre
1.609e+9 µmMicrometre
1.609e+12 nmNanometre
1.609e+13 AAngstrom
Anglo-saxon
1.00 miMile US
1.00 miMile imp
1,760.00 ydYard US
1,760.00 ydyard imp
5,280.00 ftfoot US
5,280.00 ftfoot imp
63,360.01 inInch
Astronomic
5.214e-14 pcParsec
1.706e-13 AlAnnee lumiere
1.075e-8 AEUnite astronomique
8.948e-8 MnlMinute lumiere
5.375e-6 SlSeconde lumiere
Nautique
0.868 n.miMile Nautique

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meter

Meter

The meter is the basic unit of length in the International System (SI). It is defined since 1983 as the distance light travels in vacuum in 1/299792458 second.

History

  • before 1791 : the lengths were measured in reference to humans (the thumb, foot, fathom) as every human being is different, it often took as reference the King, was a strong symbol of monarchy.
    • 1668 : the meter is equal to 38 inches of Prussia (John Wilkins)
    • 1675 : the meter is equal to the length of a pendulum that swings with a half-period of one second
  • 1791 : Academy of Sciences defines meter meridian which was based on the circumference of the earth, and worth 1 /20 000 000 a meridian.
  • 1799 : Creating a yardstick platinum from the meter M and became the reference.
  • 1889 : the International Bureau of Weights and Measures redefined the meter as the distance between two points on a bar of an alloy of platinum and iridium. This bar is always kept at the Pavillon de Breteuil in Sèvres (like the mass, the calculation of the second or UTC)
  • 1960 : The 11th General Conference on Weights and Measures (CGPM) redefined the meter as 1 650 763.73 wavelengths of orange radiation emitted by the isotope 86 of krypton4.
  • 1983 : Following the discovery of relativity, the speed of light is fixed at 299,792,458 m /s and the meter is redefined as the distance light travels in a vacuum in 1 /299792458 second. This is the most accurate definition for the second unit is the International System (SI) measured with the lowest uncertainty.