Question

define density and relative density pressure

Answer 1

Relative density, or specific gravity, is the ratio of the density (mass of a unit volume) of a substance to the densityof a given reference material. Specific gravity usually means relative densitywith respect to water. The term "relative density" is often preferred in scientific usage.

Answer 2

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Density may be define as the ratio of mass to volume of a substance.
Or, The ratio of mass to volume of a substance is called its density.

Relative density is defined as the ratio of density of any substance to the density of water. It has no unit.

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