Question

What is relative density in terms of density of substance?

• A. Ratio of density of substance to the density of given reference material
• B. Ratio of density of given reference material to the density of substance
• C. Ratio of density of water to the density of given reference material
• D. None

Answer 1

The correct option is A Ratio of density of substance to the density of given reference material

Relative density, or specific gravity, is the ratio of the density of a substance to the density of given reference material. Specific gravity for liquids is nearly always measured with respect to water at its densest; for gases, the reference is air at room temperature.

$\text{relative density}=\frac{\text{density of the unknown material}}{\text{density of water or reference material}}$