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ⓘ Absorption is a condition in which something takes in another substance. It is a physical or chemical phenomenon or process, in which atoms, molecules, or ions ..




                                               

Scattering

When radiation hits something it may be sent off in many directions. This is scattering and is distinct from absorption, reflection, and refraction. Kinds of scattering include: Tyndall effect Compton scattering Thomson scattering Rayleigh scattering Mie scattering

                                     

ⓘ Absorption

Absorption is a condition in which something takes in another substance. It is a physical or chemical phenomenon or process, in which atoms, molecules, or ions enter in the inner part of a gas, liquid, or solid material.

This is a different process from adsorption. Molecules undergoing absorption are going deep into the volume of the material, instead in the case of adsorption molecules stop at the surface of the material. A more general term is sorption, which covers absorption, adsorption, and ion exchange.

Other meanings of "absorption" are:

  • Physics: receiving of electromagnetic radiation by a material.
  • Biology: entry of substances through the skin or other boundaries such as the intestine or cell membrane.
  • Pharmacology: release of drugs into the blood.