Absorption refers to the absorption of sound waves by a material. The absorption is the "missing piece", when comparing the total reflected and transmitted energy with the incident energy.
It is the property of a material that changes acoustic energy into usually heat energy. A material or surface that absorbs sound waves does not reflect them. Absorption of a given material is frequency-dependent and is affected by the size, shape, location, and mounting method used.
A good sound absorber is normally a porous material.
Mineral wool, glass wool, and micro perforated plates work as sound absorbers.
Absorption is not a single mechanism of sound
attenuation. Propagation through a heterogeneoussystem is affected by scatteringas well.
Acoustical absorption is represented with the symbol A.
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