To measure the magnitude of a quantity, a fixed quantity of that kind is taken as basis, and then, whole quantity is compared with it. The fixed quantity that is taken as basis is called unit and the process of comparing the quantity with this unit is termed as measurement. In other words, measurement means recording of the magnitude of given quantity in terms of its base units, for example, length of a given object (say a rod) is measured as x metre, where x is the magnitude and metre is the unit that represents a standard length as accepted by Bureau of International Standards. The process of comparing the given quantity with fixed unit (or standard) is called measurements.
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