Absorption (acoustics)

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 heterogeneous system is affected by scattering as well.

Acoustical absorption is represented with the symbol A.

See also

* Absorption coefficient
* Acoustic board
* Attenuation coefficient
* Anechoic chamber


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