Length

The SI unit of Length

The SI unit of length is the metre and is equal to 1650763.73 wavelengths in vacuum of the radiation corresponding to the transition 2p₁₀-5d_s of a krypton 86 atom.

Conversions

1 foot	=	0.3048 m		1 fathom	=	1.8288 m
1 mile	=	1609 m		1 nautical mile	=	1852 m
1 cable	=	219.456 m		1 inch	=	0.0254 m

Examples

Classical electron radius	2.817940285x10-15m
Wavelength of red visible light	7x10-7m
Equatorial radius of the Earth	6.37814x106m
Orbital semi-major axis about the sun	1.495979x1011m

See also: Foot, Mensuration, Metre, Nautical Mile, SI Units, Surveyor′s Wheel.