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.

Look at other dictionaries:

  • absorbance — [ apsɔrbɑ̃s ] n. f. • v. 1970; de absorbant ♦ Opt. Grandeur mesurant la diminution d intensité d un rayonnement après un parcours dans un milieu absorbant (⇒ absorption). ● absorbance nom féminin (de absorber) Grandeur caractérisant le pouvoir… …   Encyclopédie Universelle

  • Absorbance — Optical density redirects here. Optical density can also refer to index of refraction.[1] In spectroscopy, the absorbance A (also called optical density)[2][3] is defined as:[4] , where I is the inte …   Wikipedia

  • Absorbance — L absorbance mesure la capacité d un milieu à absorber la lumière qui le traverse. On l appelle également densité optique ou extinction. Il s agit d une grandeur sans unité donnée par la relation : L absorbance est définie par le logarithme… …   Wikipédia en Français

  • 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 — 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

  • absorbance — É™b sÉ”rbÉ™ns /É™b sɔː bÉ™ns n. percentage of the passage of light through a liquid; degree to which something is absorbed …   English contemporary dictionary

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