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what is fundamental unit and derived uni...

what is fundamental unit and derived unit ?

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Comparison with certain basic internationally accepted reference standard is called unit.
Measurement of physical quantity is expressed by number accompanied by a unit.
Although number of physical quantities are very large we need only limited no. of units for expressing all physical quantities. Since they are interrelated with one another.
The unit for fundamental or base quantities are called fundamental or base unit.
Physical quantities which are expressed as combination of fundamental quantities are called derived quantities and their unit are called derived unit.
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