absorptivity (plural absorptivities)
- The quality of being absorptive; absorptiveness. [First attested in the mid 19th century.]
- (thermodynamics) The fraction of radiation absorbed by a surface to the total radiation incident on the surface. [First attested in the mid 19th century.]
- (analytical chemistry) The constant a in the Beer's law relation A = abc, where A is the absorbance, b the path length, and c the concentration of solution. Also known as absorptive power. Formerly known as absorbency index; absorption constant; extinction coefficient.
the quality of being absorptive
constant in Beer's law
fraction of radiation
- “absorptivity” in Lesley Brown, editor-in-chief; William R. Trumble and Angus Stevenson, editors, The Shorter Oxford English Dictionary on Historical Principles, 5th edition, Oxford; New York, N.Y.: Oxford University Press, 2002, ISBN 978-0-19-860457-0, page 9.