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 (synset 113607658)
    "absorptance equals 1 minus transmittance"
    is a type of: coefficient - a constant number that serves as a measure of some property or characteristic
    same as: absorption coefficient, coefficient of absorption

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