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What does absorbance mean?

Looking for the meaning or definition of the word absorbance? Here's what it means.

Noun
  1. (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. [First attested in the mid 20th century.]
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Examples
Under visible light irradiation, much longer durations were necessary to achieve similar absorbance decreases.
The total cavity loss is then the sum of the mirror transmission and the sample absorbance.
The term extinction coefficients describes the absorbance spectra of a single pure substance at known concentrations.
The 10 ml samples were centrifuged and the absorbance of the supernatant was measured at 280 nm to determine the lignin content.
First, the emission spectrum of the donor molecule must overlap with the absorbance spectrum of the acceptor.
This absorbance is an average for healthy leaves as measured with an integrating sphere.

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