Question

Define relative density for the answer class 9

Answer 1

Relative density, or specific gravity,[1][2] is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. Specific gravity for liquids is nearly always measured with respect to water at its densest (at 4 °C or 39.2 °F); for gases, the reference is air at room temperature (20 °C or 68 °F). The term "relative density" is often preferred in scientific usage.

Specific gravity

Common symbols

SG

SI unit

Unitless

Derivations from

other quantities

{\displaystyle SG_{\text{true}}={\frac {\rho _{\text{sample}}}{\rho _{\mathrm {H_{2}O} }}}}{\displaystyle SG_{\text{true}}={\frac {\rho _{\text{sample}}}{\rho _{\mathrm {H_{2}O} }}}}

Answer 2

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