Physics is a Science based upon exact measurement and observation. For the record of our observations and for the comparison of our measurements with those of other we must agree on a common language, definition of the terms and a set of standards. If the length of one meter is different for different persons a customer buying 3 meters of cloth will either get more or less cloth from the different shopkeepers. Similarly, if a grocer's kilogram weight less than the standard kilogram he is considered dishonest. These two examples illustrate the necessity of having standards of various kinds for different sort of measurements. These standards are expressed in different measuring units. The fundamental units of measure in science are those for length, time and mass.
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