Absorbance vs. Absorptance

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Absorbancenoun

(physics) A logarithmic measure of the amount of light that is absorbed when passing through a substance; the capacity of a substance to absorb light of a given wavelength; optical density.

Absorbance

Absorbance is commonly defined as . Alternatively, for samples which scatter light, absorbance may be defined as .

Absorptancenoun

Absorbed radiation and incident radiation in a ratio format; a measurement that shows how well a surface absorbs radiation.

Absorptancenoun

a measure of the rate of decrease in the intensity of electromagnetic radiation (as light) as it passes through a given substance; the fraction of incident radiant energy absorbed per unit mass or thickness of an absorber;

Absorptance

Absorptance of the surface of a material is its effectiveness in absorbing radiant energy. It is the ratio of the absorbed to the incident radiant power.

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