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what is meant by homogenity of dimensions?

 According to this principle,a physical relation is dimensionally correct if the dimensions of fundamental quantities(mass,length and time) are the same in each and every term on either side of the equation.This principle is based on the fact that only quantities of the same kind (or dimensions) can be added or subtracted.For example,consider the equation ,A = B + C.Here the quantities A,Band C have the same dimensions.