The SI units are a system of units recognized
internationally and used in all scientific literature. This is a modern metric system of
units deriving its name from Le Système International d'Unités in French. The SI was
established in 1960 and has 7 base unit which are sufficient to express any other
physical unit. There are another 22 derived units which have been named especially to
make their use easier.
The 7 base units have been chosen
such that none of them can be expressed as any of the others and there is no need to
have another unit to express any physical quantity in the universe. The base units are
meter for length, kilogram for mass, second for time, ampere for electric current,
Kelvin for temperature, mole for amount of substance and candela for luminous
intensity.
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