SI is the latest form of metric system and absorbs in it the rationalized MKSA system. SI stands for “Systeme International d’ Unites” in French. This abbreviation is now adopted by the International Standardising Organisation as the abbreviated name of this new system of units in all languages.
The SI system is, in fact, simply the RMKSA system expanded by adding the degree Kelvin, Candela and mole as basic units of temperature, luminous intensity and amount of substance respectively. The SI system is a comprehensive, logical and coherent system, designed for use in all branches of science, engineering and technology.
This system derives all the units from the following seven base units:
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The SI system, besides seven base units, has following supplementary units:
Some of the derived units in SI system are tabulated below:
Recommended prefixes for formation of multiples and sub-multiples of units are given below:
