SI units
Standard system of scientific units used by scientists worldwide. Originally proposed in 1960, it replaces the m.k.s., c.g.s., and f.p.s. systems. It is based on seven basic units: the metre (m) for length, kilogram (kg) for mass, second (s) for time, ampere (A) for electrical current, kelvin (K) for temperature, mole (mol) for amount of substance, and candela (cd) for luminosity.
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