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Absorption is a condition in which something takes in another substance. It is a physical or chemical phenomenon or process,[1] in which atoms, molecules, or ions enter in the inner part (called "bulk") of a gas, liquid, or solid material.

This is a different process from adsorption. Molecules undergoing absorption are going deep into the volume of the material, instead in the case of adsorption molecules stop at the surface of the material. A more general term is sorption, which covers absorption, adsorption, and ion exchange.

Other meanings of "absorption" are:

Notes[change | change source]

  1. Such as diffusion, for example.