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Absorptivity
(redirected from Beer-Lambert law)

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absorptivity [əb‚sȯrp′tiv·əd·ē]
(analytical chemistry)
The constantain the Beer's law relationA=abc,whereAis the absorbance,bthe path length, andcthe concentration of solution. Also known as absorptive power. Formerly known as absorbency index; absorption constant; extinction coefficient.
(thermodynamics)
The ratio of the radiation absorbed by a surface to the total radiation incident on the surface.

Absorptivity 

(or absorptive power), αv, the fraction of a monochromatic radiation flux of frequency v that is absorbed by a body on which the flux is incident. Although often called the absorption factor, it differs from the absorption factor in that it applies only to radiation of a specific frequency. The absorption factor is the integral of the absorptivities over all the frequencies present in the irradiating flux. The absorptivity for thermal radiation is dependent not only on the frequency or wavelength of the radiation but also on the temperature T of the body:

α = α(ν, T) = α*(λ, T)

REFERENCE

Landsberg, G. S. Optika, 4th ed. Moscow, 1957. (Obshchii kurs fiziki, vol. 3.)


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The tester adopts the ultraviolet ray absorption principle and is based on the Beer-Lambert law to inspect the ozone concentration without the use of chemicals.
7,8,9) The Beer-Lambert law is the mathematical principle used to describe light absorption and the properties of the material through which the light is traveling.
The Beer-Lambert law states that when light passes through a solution containing some concentration of dye, the amount of light absorbed by the dye solution is proportional to both the concentration of dye and the pathlength of the light with the solution.
 
 
 
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