Question

Give the unit of density and relative density and why relative density is unit less?

Answer 1

Unit of density is kg/m³ or gm/cm³ and there is no unit of relative density as it is represented in the form of ratio.

Answer 2

Relative density, or specific gravity, is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. ... If a substance's relative density is less than one then it is less dense than the reference; if greater than 1 then it is denser than the reference.