absorptance

1 definition found

absorptance - WordNet (r) 2.1 (2005) :

  absorptance
      n 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" [syn:
           absorption coefficient, coefficient of absorption,
           absorptance]