SupportGlossary Optical Processes & Properties 

Absorption

The capture of energy (light, ultraviolet, or infrared) by water, particles, or any other substance; a component of attenuation.  Absorbed energy may be re-radiated as heat or fluorescence, or used for photosynthesis in plants.  It is usually measured in terms of the absorption coefficient a, one of the two fundamental Inherent Optical Properties.
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