**DIMENSIONS**

#### Dimensions of a physical quantity are the power to which the fundamental quantities must be raised to represent the given physical quantity.

#### For example,

#### Thus, the dimensions of density are **1** in mass and **–3** in length. The dimensions of all other fundamental quantities are zero.

#### For convenience, the fundamental quantities are represented by one letter symbols. Generally mass is denoted by *M*, length by *L*, time by *T* and electric current by *A*.

#### The thermodynamic temperature, the amount of substance and the luminous intensity are denoted by the symbols of their units *K, mol and cd* respectively. The physical quantity that is expressed in terms of the base quantities is enclosed in square brackets.

*K, mol and cd*

**PROBLEMS**

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