Absorptivity Definition

Definition: Absorptivity is the absorption cross section or extinction coefficient. Absorptivity varies with wavelength and is defined as the absorbance of a solution per unit path length and concentration:

a = A/(bc)

where a is absorptivity, A is absorbance, b is path length, and c is the concentration

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Helmenstine, Anne Marie, Ph.D. "Absorptivity Definition." ThoughtCo, Mar. 17, 2017, thoughtco.com/definition-of-absorptivity-604352. Helmenstine, Anne Marie, Ph.D. (2017, March 17). Absorptivity Definition. Retrieved from https://www.thoughtco.com/definition-of-absorptivity-604352 Helmenstine, Anne Marie, Ph.D. "Absorptivity Definition." ThoughtCo. https://www.thoughtco.com/definition-of-absorptivity-604352 (accessed September 23, 2017).