Process whereby a porous material extracts one or more substances from an atmosphere, a mixture of gases, or a mixture of liquids (from Gatley, Understanding Psychrometrics).

Related terms: Adsorption, Hydrophilic, Hydrophobic Related resources: BSD 138: Moisture and Materials, Info-500: Buildng Materials Property Table; CP1013: Assessing the Freeze-Thaw Resistance of Clay Brick for Interior Insulation Retrofit Projects