Question

what is the difference between density of a substance and its relative density. write Si units of both

Answer 1

density of substance is ratio of its mass to volume. si unit is gm/cm3.
relative density is ratio of its density w.r.t. another substance.this quantity has no unit

Answer 2

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• Density is defined as mass per volume. Density of a material is the amount of substance contained in unit volume of the material. SI unit of density is kg/m³.

• Relative density is the ratio of density of a substance to the density of a reference material. Usually, the reference material is water. Relative density is also known as specific gravity.