What is the SI unit of relative density of a substance?

Correct option is D

The correct answer is (d) No unit.
· Relative density (also known as specific gravity) is a ratio of the density of a substance to the density of a reference substance (usually water for liquids and solids, air for gases).
· Since it is a ratio of two densities, the units of density cancel out, making relative density a dimensionless quantity.
· Therefore, relative density has no units.
Information Booster:
· kg m3: This is incorrect. kg m3 is not a unit of density; it should be kg/m3 for density.
· kg m-3: This is incorrect. This is the unit of density (kilograms per cubic meter), not relative density.
· m3: This is incorrect. Cubic meters (m3) is a unit of volume, not density or relative density.