Base and Derived Units of the SI System
The basis of the SI units rests upon seven base units and two supplementary units that are listed in first table shown below. From such base units we can derive other units to state quantities like power, area, force and so forth. There is actually no limit to the number of units we can derive, though some take place so often that they have been given extraordinary names. Therefore, rather than saying that the unit of force is kg.m/s2, we employ the less cumbersome term “Newton”. Some of the derived units that have special names are listed in the second table shown below.
Base and Derived Units of the SI System
Table: Derived Units with Special Names