Till 1960 many countries of this world use different system of units . From them two important system first C.G.S and second British engineering system in the C.G.S system the unit of length is cm.unit of mass is gram and unit of time is second and in British engineering system unit of length is foot, unit of mass is slug and unit of time is second in these two systems the unit of time is same. Because of different systems their was many confusions and for this world needed a 1 unit system and its called S.I system.
In 1960 there was a international meeting in Paris and in this meeting many countries say that their should be a one system called S.I and in under that discipline unit of mass and time is meter , kilogram and second keeped. and they are also called basic units.
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