The SI Units

The SI units possess a number of extraordinary features that are shared by no other system of units:

• It is a decimal system.

• It uses many units that are generally used in industry and commerce; example, ampere, volt, watt, kilogram, and so on.

• It is a coherent system that expresses with preliminary simplicity some of the most fundamental relationships that take place in electricity, in mechanics, and in electro-mechanics. (In brief, a system is said to be coherent whenever products and quotients including one unit of A, one unit of B, and one unit of C, and so on results one unit of X).

• It can be employed by the research scientist, the practicing engineer the technician, and the layman, therefore blending the theoretical and the practical world.