ratio between the amount of radiation absorbed by a surface and the amount of radiation falling upon it (Physics)
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Absorptance Definition from Science & Technology Dictionaries & Glossaries
The ratio of the radiation absorbed by a surface to the total energy falling on that surface described as a percentage.
Absorptance Definition from Encyclopedia Dictionaries & Glossaries
In science, the term absorptivity (or absorptance) has various meanings:
- In chemistry, it usually refers to Molar absorptivity: the constant
used in the Beer-Lambert law,
, where
is the absorbance,
is the concentration of the solution, and
is the path length.
- In physics, the word is used interchangeably with absorbance, and in this context it means the fraction of radiation absorbed at a given wavelength.
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Absorptance Definition from Language, Idioms & Slang Dictionaries & Glossaries
Noun
1. a measure of the rate of decrease in the intensity of electromagnetic radiation (as light) as it passes through a given substance; the fraction of incident radiant energy absorbed per unit mass or thickness of an absorber; "absorptance equals 1 minus transmittance"
(synonym) absorption coefficient, coefficient of absorption
(hypernym) coefficient
