# Beer-Lambert law

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## Beer-Lam·bert law

(bēr lam'bert),
the absorbance of light is directly proportional to the thickness of the media through which the light is being transmitted multiplied by the concentration of absorbing chromophore; that is, A = εbc where A is the absorbance, ε is the molar extinction coefficient, b is the thickness of the solution, and c is the concentration.
[August Beer, Johann Heinrich Lambert]
Farlex Partner Medical Dictionary © Farlex 2012

## Beer’s law

A law stating that the concentration of an analyte is directly proportional to the amount of light absorbed, or inversely proportional to the logarithm of the transmitted light.

Beer’s law
A = abc = log(100/%T) 2 - log %T

where:
A = absorbance
a = absorptivity
b = light path of the solution in cm
c = concentration of the substance of interest
%T = per cent transmittance—the ratio of transmitted light to incident light
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

## Beer,

August, German physicist, 1825-1863.
Beer-Lambert law - the absorbance of light is directly proportional to the thickness of the ligand through which the light is being transmitted multiplied by the concentration of absorbing chromophore.
Beer law - the intensity of a color or of a light ray is inversely proportional to the depth of liquid through which it is transmitted.

## Lambert,

Johann Heinrich, German mathematician and physicist, 1728-1777.
Beer-Lambert law - see under Beer, August
Lambert cosine law - mathematical measure of the intensity of radiation.
Medical Eponyms © Farlex 2012
References in periodicals archive ?
Figure 9(b) shows the absorption measured from fiber optic experimentally and also calculated by Beer-Lambert Law for exponential phase as a mean for comparison.
Deviations from the Beer-Lambert law for the U.V/visible absorption spectra of NO, NO2, SO2 and NH3," Journal of Quantitative Spectroscopy & Radiative Transfer, vol.
Swinehart, "The Beer-Lambert law," Journal of Chemical Education, vol.
(12.) Beer-Lambert Law. Available online at: http://elchem.kaist.ac.kr/vt/chemed/spec/beerslaw.htm Accessed February 6, 2007
The concentration of an analyte can be determined by measuring the absorbance at some wavelength and applying the Beer-Lambert Law (we will leave that for another column).
The section on quantitative analysis begins with the well-known Beer-Lambert law that relates concentration to the measured absorbance.

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