short notes on measurement & unit
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All the quantities in terms of which laws of physics are described, and whose measurement is necessary are called physical quantities. A definite amount of a physical quantity is taken as its standard unit.
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A unit of measurement is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity. Any other quantity of that kind can be expressed as a multiple of the unit of measurement. For example, a length is a physical quantity.
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