when making measurements of a physical quantity,the final result is expressed as a no followed by the unit.
si unit contains three classes of unit
base unit
derived unit
supplementary unit
base unit in SI :there are seven base units:
1.the meter,the standard of length,
2.the kilogram,the standard of mass,
3.the second,the standard of time,
4.the ampere,the standard of electric current,
5.the kelvin,the standard of temperature
6.the candela,the standard of luminous intensity,and
7.the mole,the standard of amount of substance
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