Chemistry and biology

• Absorption (chemistry), absorption of particles of gas or liquid in liquid or solid material
• Absorption (skin)
  Absorption (skin)
  Skin absorption is a route by which substances can enter the body through the skin. Along with inhalation, ingestion and injection, dermal absorption is a route of exposure for toxic substances and route of administration for medication...
  
  , a route by which substances can enter the body through the skin
• Absorption (pharmacokinetics)
  Absorption (Pharmacokinetics)
  In pharmacology , absorption is the movement of a drug into the bloodstream.Absorption involves several phases...
  
  , absorption of drugs in body
• CO2 scrubber, the absorbent in a rebreather
• Absorption (small intestine)

Physics and mechanical engineering

• Absorption (electromagnetic radiation)
  Absorption (electromagnetic radiation)
  In physics, absorption of electromagnetic radiation is the way by which the energy of a photon is taken up by matter, typically the electrons of an atom. Thus, the electromagnetic energy is transformed to other forms of energy for example, to heat. The absorption of light during wave propagation is...
  
  , absorption of light or other electromagnetic radiation by a material
• Absorption (acoustics)
  Absorption (acoustics)
  Acoustic absorption is that property of any material that changes the acoustic energy of sound waves into another form, often heat, which it to some extent retains, as opposed to that sound energy that material reflects or conducts. Acoustic absorption is represented by the symbol A in calculations...
  
  , absorption of sound waves by a material
• Dielectric absorption, a determination of how much electrical permittivity
  Permittivity
  In electromagnetism, absolute permittivity is the measure of the resistance that is encountered when forming an electric field in a medium. In other words, permittivity is a measure of how an electric field affects, and is affected by, a dielectric medium. The permittivity of a medium describes how...
  
   a material has
• Absorption refrigerator
  Absorption refrigerator
  An absorption refrigerator is a refrigerator that uses a heat source to provide the energy needed to drive the cooling system...
  
  , a refrigerator that runs on surplus heat rather than electricity
• Absorption air conditioning, a type of solar air conditioning
  Solar air conditioning
  Solar air conditioning refers to any air conditioning system that uses solar power.This can be done through passive solar, solar thermal energy conversion and photovoltaic conversion . The U.S...
  
  

Mathematics and economics

• Absorption law
  Absorption law
  In algebra, the absorption law or absorption identity is an identity linking a pair of binary operations.Two binary operations, say ¤ and *, are said to be connected by the absorption law if:...
  
  , in mathematics, an identity linking a pair of binary operations
• Absorbing element
  Absorbing element
  In mathematics, an absorbing element is a special type of element of a set with respect to a binary operation on that set. The result of combining an absorbing element with any element of the set is the absorbing element itself. In semigroup theory, the absorbing element is called a zero element...
  
  , in mathematics, an element that does not change when it is combined in a binary operation with some other element
• Absorption (economics)
  Absorption (economics)
  Absorption is the total demand for all final marketed goods and services by all economic agents resident in an economy, regardless of the origin of the goods and services themselves...
  
  , the total demand of an economy for goods and services both from within and without
• 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

See also

• Adsorption
  Adsorption
  Adsorption is the adhesion of atoms, ions, biomolecules or molecules of gas, liquid, or dissolved solids to a surface. This process creates a film of the adsorbate on the surface of the adsorbent. It differs from absorption, in which a fluid permeates or is dissolved by a liquid or solid...
  
  , the formation of a gas or liquid film on a solid surface
• Digestion
  Digestion
  Digestion is the mechanical and chemical breakdown of food into smaller components that are more easily absorbed into a blood stream, for instance. Digestion is a form of catabolism: a breakdown of large food molecules to smaller ones....
  
  , the uptake of substances by the gastrointetssuinal tract
• Flow (psychology)
  Flow (psychology)
  Flow is the mental state of operation in which a person in an activity is fully immersed in a feeling of energized focus, full involvement, and success in the process of the activity. Proposed by Mihály Csíkszentmihályi, the positive psychology concept has been widely referenced across a variety of...
  
  , a state of total mental "absorption"