What is system of units? In si what is meant by base , derived and supplementry units?
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System of units
A complete set of units sufficient for the measurement of all physical quantities is called system of units.
Base units
In SI, there are seven base quantities. Their units are clearly defined and are called base units. The base units are independent and do not depend on other units for their definition and understanding
Derived units
Derived units are those which are obtained by the multiplication and/or division of base units.
Supplementry units
This class contains two units of purely geometrical quantities; radian and steradian.
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