Worlds of David Darling
Encyclopedia of Science
   
Home > Encyclopedia of Science

absorptance




The ratio of the luminous or radiant flux absorbed by a body to the flux falling on it. Absorptance is generally represented by the Greek letter α (alpha). By definition, in the case of a blackbody α = 1. Absorptance was formerly known as absorptivity.


Related category

   • OPTICS AND OPTICAL PHENOMENA