absorbance

absorbance
In spectrophotometry, log of the ratio of the radiant power of the incident radiation to the radiant power of the transmitted radiation. SYN: absorbancy, absorbency, extinction (2), optic density.
- specific a. a. per unit of concentration. See specific absorption coefficient.

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ab·sor·bance əb-'sȯr-bən(t)s, -'zȯr- n the ability of a solution or a layer of a substance to absorb radiation that is expressed mathematically as the negative common logarithm of the transmittance of the substance or solution called also optical density

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ab·sor·bance (ab-sorґbəns) 1. in analytical chemistry, the negative logarithm of the transmittance, −log10(I/I0), where I is the light intensity transmitted by the solution under analysis and I0 is the intensity transmitted by the pure solvent or other reference solution. Symbol A. Formerly referred to as absorbancy or optical density. 2. in radiation physics, the negative logarithm of the transmittance, defined as the ratio of the radiant energy transmitted by an object (I) to the incident radiant energy (I0).

Medical dictionary. 2011.

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  • absorbance — absorbcijos geba statusas T sritis chemija apibrėžtis Pusiausvirasis absorbato ir jo prisotinto absorbento kiekių santykis. atitikmenys: angl. absorbance; absorption ability; absorption power; absorptivity rus. абсорбционная способность;… …   Chemijos terminų aiškinamasis žodynas

  • absorbance — optinis tankis statusas T sritis chemija apibrėžtis Į sistemą kritusios ir pro ją praėjusios šviesos intensyvumų santykio dešimtainis logaritmas. atitikmenys: angl. absorbance; absorbency; optical density rus. оптическая плотность …   Chemijos terminų aiškinamasis žodynas

  • absorbance unit — (AU)    a logarithmic unit used to measure optical density, the absorbance of light transmitted through a partially absorbing substance. If T is the percentage of light transmitted, then the absorbance is defined to be log10 T absorbance units.… …   Dictionary of units of measurement

  • absorbance — noun Date: 1947 the ability of a layer of a substance to absorb radiation expressed mathematically as the negative common logarithm of transmittance …   New Collegiate Dictionary

  • absorbance — /ab sawr beuhns, zawr /, n. Physics. the capacity of a substance to absorb radiation, expressed as the common logarithm of the reciprocal of the transmittance of the substance. Also, absorbancy. [1945 50; ABSORB(ENT) + ANCE] * * * …   Universalium

  • absorbance — noun A logarithmic measure of the amount of light that is absorbed when passing through a substance …   Wiktionary

  • absorbance —    The measure of concentration of material present; the negative log (base10) of transmittance [ log 1/T] of product of extinction coefficient, pathlength, and concentration, written as A = Ebc …   Forensic science glossary

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