Define density .Write its unit and dimensional formula.

Explanation

Mass per unit volume of body is called density.
If mass of body is M and volume V then density
`rho=("Mass M")/("Volume V")`
Density is a scalar quantity.
Density is always positive.
Si unit of density is : `kg//m^(3)`
CGS unit of density : `g//cm^(3)`
Dimensional formula of density : `M^(1)L^(-3)T^(0)`.
(Primarily liquids are incompressible and at any pressure its density does not change . It remains constant . Gases are compressible and density largely varies with pressure.)