Weight (mass) per unit of volume used as a measure of the compactness of a substance. It is commonly expressed as kilograms per cubic meter (kg/m3) or pounds per cubic foot (lb/ft3), although kilograms per liter (kg/l) and pounds per gallon (lb/gallon) are also sometimes used. Density of water is one gram per cubic centimeter (g/cm3), steel 7.9 g/cm3, lead 11 g/cm3, gold 19 g/cm3, ice 0.92 g/cm3, gasoline 0.8 g/cm3, common wood 0.65 g/cm3, cork 0.24 g/cm3, and air (at sea level) 0.0013 g/cm3. Average density (D) is computed by the formula D = m ÷ V where 'm' is the mass of a substance and 'V' is its volume. Relative density (also called specific gravity) is the ratio of the density of a substance at 20°C or 68°F to the density of water at 4°C or 39.2°F. See also bulk density.

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