| absorptiometry |
medical test used to determine bone density.
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| absorption line |
A line of finite width in the absorption spectrum. Absorption lines are characterized by their central wavelength, line intensity, and line width.
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| absorption spectrum |
The detailed dependence on wavelength of the intensity of radiation absorbed by a given medium. Absorption spectra of gases are typically composed of discrete spectral lines and bands of overlapping lines that depend on the molecular or atomic composition of the absorbing substance and that may be used to identify it uniquely. ...
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| absorptivity |
The fraction of incident radiation that is absorbed by matter. Absorptivity may be a function of wavelength and/or direction, and is related to the emissivity of the region by Kirchhoff's law. The absorptivity is identically equal to unity for blackbodies and is independent of wavelength for gray bodies.
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| absorption coefficient |
A measure of the extinction due to absorption of monochromatic radiation as it traverses a medium. Usually expressed as a volume absorption coefficient, k v , with units of reciprocal length (ie, area per unit volume), but also as a mass absorption coefficient, k m , with units of area per unit mass. The two are related by k v = k m , where is the density of the absorber. See also absorption optical thickness.
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