Mass density

Density is more presisely called volumetric mass density or mass
density. mass drnsity means the mass of any objects in its per unit
volume. Methematically mass density is expressed as roh symbol. mass
divided by volume is mass density.

mass density is simplifies by comparing with the density of water. it
is called relative density or specific gravity. If relative density of
any object is less then one, it means that it will be float on water.