The unit is known as definite magnitude of a physical quantity. The physical quantities can be measured by utilizing various units depending upon the quantities. For example the weight of the rice, sugar, wheat etc. can be calculated by utilizing kilogram, gram, tons etc. A set of fundamental units is a set of units of measurement for physical quantities from which every other unit can be generated A system of weights as we will as measures based on the principle that each as we will as every quantity should’ve one unit whose multiples as we will as sub multiples are all derived by multiplying or dividing by powers of ten. The standard unit is also called as metric system. In this section we will learn more about different units as we will as its conversions .