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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
The absorbance was measured with a microtiter plate reader at a test wavelength of 405 nm.
Upon measuring the absorbance of a labeled peptide at a given angle of incidence, two different dichroic ratios were obtained.
This absorbance is an average for healthy leaves as measured with an integrating sphere.
The 10 ml samples were centrifuged and the absorbance of the supernatant was measured at 280 nm to determine the lignin content.
The absorbance measured is directly proportional to the concentration of human leptin present.
The total cavity loss is then the sum of the mirror transmission and the sample absorbance.

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