Definitions for absorptanceæbˈsɔrp təns, -ˈzɔrp-
Random House Webster's College Dictionary
ab•sorp•tanceæbˈsɔrp təns, -ˈzɔrp-(n.)
the ratio of the amount of radiation absorbed by a surface to the amount of radiation incident upon it.
Category: Physics, Optics
Origin of absorptance:
absorption coefficient, coefficient of absorption, absorptance(noun)
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"
The ability of an object to absorb radiation, measured as the ratio of absorbed flux to incident flux.
Origin: Circa 20th century, from .