Vapour density

Regarding ink, the relative thickness of a layer of printed ink. Also, regarding color, the relative ability of a color to either absorb light reflected from it, or block light ...

density

Industrial machinery; Industrial lubricants

The mass of a unit volume of a substance. Its numerical value varies with the units used.

density

Building materials; Tiles

The ratio of the mass of a body to its volume, or the mass per unit volume of the substance. When G. G. S. Units are used, the density of a substance is numerically equal to the ...

density

Astronomy; Mars

The amount of matter in a unit volume of a substance; usually the mass per unit of volume.

lead

Pollution control; Air pollution

A gray-white metal that is soft, malleable, ductile, and resistant to corrosion. Sources of lead resulting in concentrations in the air include industrial sources and crustal ...

nonattainment area

Pollution control; Air pollution

A geographic area identified by the U. S. EPA and / or CARB as not meeting either NAAQS or CAAQS standards for a given pollutant. For more information, please view our designated ...

air toxics

Pollution control; Air pollution

A generic term referring to a harmful chemical or group of chemicals in the air. Substances that are especially harmful to health, such as those considered under U. S. EPA's ...

nitrogen oxides

Pollution control; Air pollution

A general term pertaining to compounds of nitric oxide (NO), nitrogen dioxide (NO 2 ) and other oxides of nitrogen. Nitrogen oxides are typically created during combustion ...