absorptance
n.
ratio between the amount of radiation absorbed by a surface and the amount of radiation falling upon it (Physics)
absorptance
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
absorptance
ABSORPTANCE
ASSORBIVITÀ. FATTORE DI ASSORBIMENTO
absorptance