The Beer Lambert Law is also known as Beer’s law, Beer-Lambert-Bouguer law or Lambert-Beer law. This law was discovered by Pierre Bouguer before 1729. It is the linear relationship between absorbance and concentration of an absorbing species. While working in concentration units of molarity, the Beer’s law is written as a=e*c*l. Where a is the Absorbance, e is the Molar absorption coefficient, l is the Path Length and c is the Concentration.
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Formula Absorbance using Beer’s Law
Absorbance = Molar Absorption Coefficient x Path Length x Concentration
Example Absorbance using Beer’s Law
For a substance with molar absorption coefficient 50 m2/mol, concentration 10 mol/L and path length 5 m, the absorbance using beer’s lambert law can be calculated as
= 50 x 5 x 10