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Absorption (chemistry), absorption of particles of gas or liquid in liquid or solid material

Absorption (Pharmacokinetics), absorption of drugs in body

Absorption (electromagnetic radiation), absorption of light or other electromagnetic radiation by a material

Absorption (acoustics) , absorption of sound waves by a material

Absorption (digestive), the uptake of substances by the gastrointestinal tract

Absorption air conditioning. See for solar air conditioning.*

Absorption law, in mathematics, an identity linking a pair of binary operations

Dielectric absorption, interaction and absorption of energy from an applied electromagnetic field by a dielectric material

Flow (psychology), a state of total mental "absorption"

Absorption (economics), the total demand of an economy for goods and services both from within and without

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Adsorption, the formation of a liquid or gas film on a solid surface.