define units .give characteristics of a units
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The chosen standard of measurement of a quantity which has essentially the same nature as that of the quantity is called the unit of quantity.
Characteristics-
1 It should be of suitable size
2 It should be easily accessible
3 It should be accurately defined
4 It should not change with time
Characteristics-
1 It should be of suitable size
2 It should be easily accessible
3 It should be accurately defined
4 It should not change with time
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