SI System of Units
SI system of units is the modernised and improved form of the previous system of units. It is accepted in almost all the countries of the world. It is based on a certain set of fundamental units from which derived units are obtained by multiplication or division. There are seven fundamental units in the SI system of units. They are also known as base units as in Table 2.
With the help of these seven fundamental units, units for other derived quantities are obtained and their units are given below in Table-3.