CBSE Class 9 Answered

Let us consider other possibilities of physical quantities which can be used in the dimensional analysis,

• Instead of M,L and T if we use V,L and T it is observed that  the usage of V is redundant as V itself, is a derived physical quantity, as   where V is the dimensional abbreviation for Velocity.

• Similarly even the usage of F for force will not give us a linear or fundamental dimensional representation for a physical quantity, because, .

• Thus it is concluded that the usage of M, L and T where M :-Mass, L:- Length and T:-Time is the most preferred base units in the dimensional formula as it gives us perfectly linear and a fundamental dimensional analysis.

• It  also be learnt that for representing temperature, K is used as the base unit.