Absorption

Absorption has a number of meanings:

In physics, absorption is a process in which particles of some sort encounter another material and are taken up by or even disappear in it. Specifically, it can refer to:

Volume absorption of particles of gas or liquid in liquid or solid material is studied in physical chemistry.
In optics absorption refers to the absorption of photons by a material.
In acoustics absorption refers to the absorption of sound waves by a material.

Absorption should not be confused with adsorption, the formation of a liquid or gas film on a solid surface.

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