High Quality Content by WIKIPEDIA articles! A unit of measurement is a definite amount of a physical quantity, defined and adopted by convention and or law, that is used as a standard for measurement of the same physical quantity of any amount.A unit is a universally recognised symbol that represents the definite amount of the physical quantity. For measurement, a pure number is written before the unit that indicates how many times the predefined amount of the concerned physical quantitiy is meant.

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