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What is Beer-Lambert Law?

by Team Goseeko

The Beer- Lambert was stated by two people resulting in the name of the law is Beer-Lambert law.

It states for any given material, the sample path length and concentration of the sample are directly proportional to the absorbance of the light.

Additionally , the law states that the concentration of the solution and also the absorbance are directly proportional to each other. This statement was stated by August Beer.

In addition, Lambert law states that absorbance and path length are directly proportional and it was stated by Johann Heinrich Lambert.

The Beer-Lambert law equation is as follows:



I is the intensity

I0 is the initial intensity

μ is the coefficient of absorption

x is the depth in meter

The Beer-Lambert law relates the attenuation of light to the properties of the material through which the light is travelling.

The law applies to the analysis of a mixture by spectrophotometry, without the need for extensive pre-processing of the sample.

Above all the Beer-Lambert law states that the absorption of energy in a solution is directly proportional to the molar absorptivity,

Additionally the solute concentration is also an important factor in the absorption of energy for the given solution


Beer’s law is important in the field of Physics, Chemistry and Meteorology.

Also in Chemistry, it is useful to measure chemical solution concentrations and also analyze oxidation,

In other words, The law also plays an important role in the measure of polymer degradation.

Additionally, the attenuation of radiation through the atmosphere of the earth is also specified in the law

Therefore Beer-Lambert law is not applicable to solutions of high concentrations (>0.01M) , the reason is due to electrostatic interactions between molecules that are in proximity

Applications of the Law

This law finds applications in Analytical chemistry: This analysis mainly concentrates on the separation, quantification, and identification of matter by spectrophotometry.

There is no involvement of extensive pre-processing of the sample to get the results.

For instance, the bilirubin count in a blood sample determined by using a spectrophotometer.

Therefore , in the atmosphere Solar or stellar radiation in the atmosphere is described in other words used in this law. 

 In other words, the law is commonly applies to chemical analysis measurements and useful in understanding attenuation in physical optics, for photons, neutrons, or rarefied gases.

In addition, in the subject mathematical physics, this law arises as a solution of the BGK equation

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