absorption factor Ratio of the absorbed quantity (uptake) of a substance to the administered quantity (intake). Note: For exposure by way of the respiratory tract, the absorption coefficient is the ra [..]

A measure of the extinction due to absorption of monochromatic radiation as it traverses a medium. Usually expressed as a volume absorption coefficient, kv, with units of reciprocal length (i.e., area [..]

A measure of the attenuation caused by absorption of energy that results from its passage through a medium. [After 2196] Note 1: Absorption coefficients are usually expressed in units of reciprocal distance. Note 2: The sum of the absorption coefficient and the scattering coefficient is the attenuation coefficient.

A number determined from the amount of sound energy absorbed from an incoming sound wave, at a specified frequency, when it encounters a material or surface under known conditions.

Measures the degree of wave absorption (see Absorption above); defined as the fraction of wave energy lost as the wave travels a unit distance.

The ratio at which photons are absorbed over unit of distance as they travel through material with photovoltaic properties (e.g. silicon)

A measure of the amount of radiant energy, incident normal to a planar surface, that is absorbed per unit distance or unit mass of a substance.

The fractional decrease in transmitted intensity per unit of absorber thickness. It is usually designated by the symbol µ and expressed in units of (cm-1.2).

the ability of a material to absorb sound waves at a particular frequency, with a higher coefficient indicating better acoustical damping. Sometimes called a sound absorption coefficient and abbreviat [..]

<physics> Measures the degree of wave absorption defined as the fraction of wave energy lost as the wave travels a unit distance. See: absorption. (15 Jan 1998)

(physics) A measure of the absorption of electromagnetic radiation as it passes through a specific substance; the fraction of incident radiation absorbed by unit mass or unit thickness; absorptivity [..]