|—n , pl -ties|
|1.||the degree to which something is filled, crowded, or occupied: high density of building in towns|
|3.||See also relative density ρ a measure of the compactness of a substance, expressed as its mass per unit volume. It is measured in kilograms per cubic metre or pounds per cubic foot|
|4.||charge density See current density a measure of a physical quantity per unit of length, area, or volume|
|5.||physics, photog transmission density See reflection density|
density den·si·ty (děn'sĭ-tē)
The mass per unit volume of a substance at a specified pressure and temperature.
The quantity of something per unit measure, especially per unit length, area, or volume.
|density (děn'sĭ-tē) Pronunciation Key
A measure of the quantity of some physical property (usually mass) per unit length, area, or volume (usually volume). ◇ Mass density is a measure of the mass of a substance per unit volume. Most substances (especially gases such as air) increase in density as their pressure is increases or as their temperature decreases. ◇ Energy density is a measure of the amount of energy (often in the form of electromagnetic radiation) per unit volume in a region of space or some material. See also Boyle's law.