the process in which a substance, usually a gas, forms a very thin layer on a surface

In simple terms, adsorption is the attraction of molecules onto the surface of a solid. 简单地说，吸附是将分子吸引到固体的表面。

A carbon-impregnated pad is used for adsorption of liquid and gaseous impurities. 碳浸渍垫被用于吸附液体和气体杂质。