coefficient of sound absorption

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.
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The incident coefficient of sound absorption shows the ratio of sound power entering the surface of the tested object to the power of incident sound for a plane wave at normal incidence (LST EN ISO 10534-2:2002).

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