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  1. Sound absorption is the change of sound energy into some other form, usually heat, in passing through a medium or on striking a surface.
  2. At a specified frequency or in a specified frequency band, property of a material or an object whereby sound energy is converted into heat by propagation in a medium or when sound strikes the boundary between two media. Source: Glossary of Terms in Noise Control Engineering
  3. (1) The process of dissipating sound energy. (2) The property possessed by materials, objects and structures such as rooms of absorbing sound energy. (3) A: [L2]; metric sabin---in a specified frequency band, the measure of the magnitude of the absorptive property of a material, an object, or a structure such as a room. Source: http://www.owenscorning.com/around/sound/glossary.asp

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