What is the SI unit of relative density and density?

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#1

What is the SI unit of relative density and density ?


#2

Relative density is the ratio of density of a substance to the density of water at 40 C .Since the units for both the numerator and denominator are same, they cancel each other. Thus relative density has no units

Density is defined as mass per unit volume.

Hence its SI unit is: kg/m3