# Absorption Coefficient

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## absorption coefficient

[əb′sȯrp·shən ‚kō·ə′fish·ənt]
Also known as absorption factor; absorption ratio; coefficient of absorption.
(acoustics)
The ratio of the sound energy absorbed by a surface of a medium or material to the sound energy incident on the surface.
(physics)
If a flux through a material decreases with distance x in proportion to e-ax, then a is called the absorption coefficient.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

## Absorption Coefficient

(kv), the inverse of the distance at which a monochromatic radiation flux that has frequency ν and forms a parallel beam is attenuated—owing to absorption in a substance—to 1/e (natural absorption coefficient) or 1/10 (decimal absorption coefficient) of its incident intensity. In the case of 1/e, the Bouguer-Lambert law is written

I = I0e-kvI

In the case of 1/10, the law is written

I = I010-kvI

The absorption coefficient is measured in cm-1 or m-1, and it is traditionally called the absorption factor in spectrography and some other branches of applied optics.

## sound absorption coefficient,

a The fraction of the sound energy (incident at random angles on a surface) which is absorbed or otherwise not reflected by the surface.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
In summary, the epoxy foam with 2 wt% microsphere content, blown at 85[degrees]C, exhibits specific properties, such as high sound absorption coefficient, great sound TL, and excellent thermal insulation property, while maintaining acceptable mechanical properties.
Such as, the capillary absorption coefficient of RAC-0% with the load of 0%[f.sub.c], 40%[f.sub.c], 60%[f.sub.c], and 80%[f.sub.c] is, respectively, 973.5 g/([m.sup.2][h.sup.1/2]), 1073.6 g/([m.sup.2][h.sup.1/2]), 1265.0 g/ ([m.sup.2][h.sup.1/2]), and 1649.1 g/([m.sup.2][h.sup.1/2]), and the results are 1245.2 g/([m.sup.2][h.sup.1/2]), 1326.4 g/([m.sup.2][h.sup.1/2]), 1788.4 g/([m.sup.2][h.sup.1/2]), and 2513.8 g/([m.sup.2][h.sup.1/2]) for RAC-100%.
The random distribution of the fibers in the fibrous absorbent materials allows the sound waves to hit the lumen of the fiber bundle and strengthen the sound absorption effect; a high absorption coefficient can be obtained.
Also, the total path loss is not shown to monotonically increase at the THz frequency band due to the fact that the MAA is caused by isotopologues of gases having various absorption coefficients at various frequencies.
The effects of [D.sub.t] and [D.sub.f] on the sound absorption coefficient [alpha] are plotted in Figure 19.
The background medium has scattering coefficient of 10 [mm.sup.-1] and absorption coefficient of 0.01[mm.sup.-1], respectively, and these values keep the same throughout this paper.
Where [[mu].sub.a(x)] is the absorption coefficient ([cm.sup.-1]), [P.sub.d] is the power density.
We can distinguish the normal people and the affected people since normal people have absorption coefficient less than 2 [cm.sup.-1] and scattering coefficient values less than 5 [cm.sup.-1].
The measured gas type, its absorption coefficient, and the gas concentration range all impact the amount of incident light on the thermopile detector, as dictated by the previously discussed Beer-Lambert law.
Photon mass attenuation and energy absorption coefficient from 1keV to 20MeV.
Nam, "The nonlinear absorption coefficient of a strong electromagnetic wave by confined electrons in quantum wells under the influences of confined phonons," Journal of Electromagnetic Waves and Applications, Vol.

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