absorptivity

1. The quality of being absorptive; absorptiveness.

2. The fraction of radiation absorbed by a surface to the total radiation incident on the surface.

   (physics) the property of a body that determines the fraction of the incident radiation or sound flux absorbed or absorbable by the body

3. 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.

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