Question

what is mean by relative density of a material give its SI unit​

Answer 1

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. ... The term "relative density" is often preferred in scientific usage. It is defined as a ratio of density of particular substance with that of water.The SI unit of kilogram per cubic metre (kg/m3) and the cgs unit of gram per cubic centimetre

Answer 2

Relative density of a substance is the ratio of density of that substance with that of water. It is a ratio so it doesn't have any unit.

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