Density

The density (symbol: ρ) or, more strictly, mass density, of a homogeneous system (or material) is the mass per unit volume. It is usually measured in grams per cubic centimetre (g cm⁻³) for condensed phases (solids and liquids) and in kilograms per cubic metre (kg m⁻³) for gases: 1 kg m⁻³ = 1000 g cm⁻³. Densities of solids and liquids usually range from 0.62 g cm⁻³ (isopentane) to 22.6 g cm⁻³ (osmium); densities of gases at normal temperatures and pressures range from 0.085 kg m⁻³ (hydrogen) to 13 kg m⁻³ (tungsten hexafluoride). Density, unlike mass or volume, is an intensive property of a system.