Density
Climate Change
The ratio of the mass of a substance to the volume occupied by it.
- — ARM Climate Research Glossary retrieved 2014-06-12
the mass per unit volume of a substance under specified conditions of pressure and temperature.
Energy
The average number of people, families, or housing units on one unit of land. Density is also expressed as dwelling units per acre.
- — Smart Growth/Smart Energy Toolkit Glossary retrieved 2014-05-26
Nuclear Physics
That property of a substance which is expressed by the ratio of its mass to its volume.
- — Glossary of Nuclear Science Terms retrieved 2014-05-20
Water
Telecommunications
In a facsimile system, a measure of the light transmission or reflection properties of an area of an object. Note 1: Density is usually expressed as the logarithm to the base 10 of the ratio of incident to transmitted or reflected irradiance. Note 2: There are many types of density, such as diffuse, double diffuse, and specular density, each of which will usually have different numerical values for different materials. The relevant type of density depends on the type of optical system, the component materials of the object, and the surface characteristics of the object. 2. In video, the degree of darkness of an image, or the percent of the screen used in an image. 3. In optics, a figure of merit that describes the degree of attenuation introduced by a filter.