The quantities which are measurable in physics is known as physical quantity.Kilogram ,meter ,second,mole candela ,ampere,Radian ,Steradian are fundamental units .This note provides us an information on the system of units.

Principle of homogeneity states that “The dimensions of fundamental quantities on a left-hand side of an equation must be equal to the dimensions of the fundamental quantities on the right-hand side of that equation.” This note provides us an information on dimension of a physical quantity.

The dimensionally correct equation is not necessarily correct mathematically. This note provides an information on applications of dimensional method.