Define density. Write its unit and dimensional formula.

(N/A) Density is defined as the mass per unit volume of a body.
If the mass of a body is $M$ and its volume is $V$,then the density $\rho$ is given by:
$\rho = \frac{M}{V}$
Density is a scalar quantity and is always positive.
The $SI$ unit of density is $kg/m^3$.
The $CGS$ unit of density is $g/cm^3$.
The dimensional formula of density is $[M^1 L^{-3} T^0]$.
Note: Primarily,liquids are incompressible,and their density does not change significantly with pressure. However,gases are compressible,and their density varies largely with pressure.