begin mathsize 48px style A equals epsilon c l end style

A = Absorbance ; ε = Molar absorption coefficient , Molar absorptivity  or Molar extinction coefficient c = Concentration ; l  = Path Length





According to the Beer Lambert Law the 'Absorbance' is proportional to the path length (distance that light travels through the material) and the concentration of the material. The proportionality constant of the equation is termed as the  molar extinction coefficient of the substance. Using this law any of the four properties can be calculated by knowing the values of the other three.  

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