Chemistry and biology
*Absorption (biology), digestion **Absorption (small intestine) *Absorption (chemistry), diffusion of particles of gas or liquid into liquid or solid materials *Absorption (skin), a route by which substances enter the body through the skin *Absorption (pharmacology), absorption of drugs into the bodyPhysics and chemical engineering
*Absorption (acoustics), absorption of sound waves by a material *Absorption (electromagnetic radiation), absorption of light or other electromagnetic radiation by a material *Absorption air conditioning, a type of solar air conditioning *Absorption refrigerator, a refrigerator that runs on surplus heat rather than electricity *Dielectric absorption, the inability of a charged capacitor to completely discharge when briefly dischargedMathematics and economics
*Absorption (economics), the total demand of an economy for goods and services both from within and without *Absorption (logic), one of the rules of inference *Absorption costing, or total absorption costing, a method for appraising or valuing a firm's total inventory by including all the manufacturing costs incurred to produce those goods *Absorbing element, in mathematics, an element that does not change when it is combined in a binary operation with some other element *Absorption law, in mathematics, an identity linking a pair of binary operationsSee also
*Adsorption, the formation of a gas or liquid film on a solid surface *Carbon dioxide scrubber, CO2 scrubber, device which absorbs carbon dioxide from circulated gas *Digestion, the uptake of substances by the gastrointestinal tract *Absorption (psychology), a state of becoming absorbed by mental imagery or fantasy *Flow (psychology), a state of total mental "absorption" {{Disambiguation