Define a unit and what are the requirement of good unit
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A unit is a standard value to compare a given physical of same nature
It should be:-
1.reproducible
2.distinguished withou ambiguity
3.should not change with space and time
4. it should be identified internationally
It should be:-
1.reproducible
2.distinguished withou ambiguity
3.should not change with space and time
4. it should be identified internationally
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