Prefixes:

The magnitude of physical quantities varies over a wide range. When the value of the physical quantities is very large or very small then it is difficult to express them in terms of the fundamental units. For this, some specific letters are used before the fundamental units. So "The letters used with a fixed value in the form of power of Ten (10) before the fundamental units are called prefixes.

or  

The mechanism at which the scientific notation is expressed in the proper name of the power of 10 is called prefixes.

The Prefixes Table is given below.





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