density
From Glossary of Meteorology
- The ratio of the mass of any substance to the volume occupied by it (usually expressed in kilograms per cubic meter, but any other unit system may be used); the reciprocal of specific volume.
In a continuous medium the density is defined by a limiting process and is a point function. - The ratio of any quantity to the volume or area it occupies; for example, flux density, power density, ion density, electron density, drainage density.
