Radiative transfert property
Absorbance
[DBpedia] In chemistry, absorbance or decadic absorbance is the common logarithm of the ratio of incident to transmitted radiant power through a material, and spectral absorbance or spectral decadic absorbance is the common logarithm of the ratio of incident to transmitted spectral radiant power through a material.
[NAL] A measure of the amount of light absorbed by a surface.