absorbance (redirected from absorbances)

absorbance /ab·sor·bance/ (-sor´bans)

1. in analytical chemistry, a measure of the light that a solution does not transmit compared to a pure solution. Symbol .

2. in radiology, a measure of the ability of a medium to absorb radiation, expressed as the logarithm of the ratio of the intensity of the radiation entering the medium to that leaving it.

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ab·sorb·ance (b-zôrbns) or ab·sorb·an·cy or ab·sorb·en·cy (b-zôrbn-s)

n.

Abbr. A In spectrophotometry, equal to 2 minus the log of the percentage transmittance of light. Also called extinction, optical density.

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absorbance

[əbsôr′bəns]

the degree of absorption of light or other radiant energy by a medium exposed to the energy. It is expressed as the logarithm of the ratio of energy transmitted through a vacuum to the energy transmitted through the medium. For solutions, it is the logarithm of the ratio of energy transmitted through pure solvent to the energy transmitted through the solution. Absorbance varies with factors such as wavelength, solution concentration, and path length.

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absorbance

in radiology, a measure of the ability of a medium to absorb radiation, expressed as the logarithm of the quotient of the intensity of the radiation entering the medium divided by that leaving it.

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absorbance 

A measure of absorption equal to the logarithm to the base 10 of the reciprocal of the transmittance T, for a specified wavelength and expressed as A = −log₁₀ T. Syn. optical density. See optical density; transmittance.