Question

define unit of a physical quantity

Answer 1

A unit is a fundamental measure of a physical quantity, in terms of which the value or size or the amount of the quantity that the substance contains, is expressed.

A meter is unit for measuring length.

Answer 2

The unit is the fundamental measurement of any physical quantity to express the amount/size/value that the substance contain .

Example - Meter is the S.I unit of length.

-------------------------------------------------------------------------------------------------------------------
Best of luck ;)
ROYALJATT