Question

What is density...?​

Answer 1

The density, of a substance is its mass per unit volume. The symbol most often used for density is ρ, although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume: ${\displaystyle \rho ={\frac {m}{V}}}$ where ρ is the density, m is the mass, and V is the volume.

Relative density, or specific gravity, is the ratio of the density 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; for gases, the reference is air at room temperature.

The SI unit for density is: kilogram per cubic metre (kg/m³).

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