Question

what is meat by unit of a physical quantity ?

Answer 1

Any quantity that can be measured is called a physical quantity.

Answer 2

The quantity which can be analysed and can be measured is called the physical quantity but the in what terms it is being measured it is called as the unit of that particular quantity .
For eg.
Force is length is measured in metres,time in seconds,mass in kilogram, amount of substance in mole, luminous intensity in candela,etc.