Question

what do you mean by dimension resprentation of any physics quantity​

Answer 1

The dimension of physical quantity may be defined as the number of times the fundamental units of mass, length and time appear in the physical quantity.

Answer 2

Definition of Dimensions of Physical Quantities

The dimension of a physical quantity is defined as the powers to which the fundamental quantities are raised in order to represent that quantity. The seven fundamental quantities are enclosed in square brackets [ ] to represent its dimensions.

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