Definition of "absorptivity" []

• 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. (noun)

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• "The absorptivity is the fraction of incident light power that is absorbed by the body/surface."
• "Ice has a very high reflectivity and a very low absorptivity in the wavelengths of solar radiation."
• "The hint is that the absorptivity of the glass in the IR is roughly unity as is that of the black cardboard, and therefore their IR emissivity is also unity in the IR by Kirchoff's law."