Beer-Lambert's law states that the amount of energy absorbed by a solution is proportional to the path length and the concentration. Simply put, a more concentrated solution absorbs more light than a dilute solution.

The equation for Beer-Lambert's law is: A = ϵ.dc

Where ϵ = molar absorptivity, d = path length and c = concentration.
Molar absorptivity is a unique physical constant of the sample that relates to the ability of the sample to absorb light at a given wavelength. ϵ has the unit L mol-1 cm-1.

Learn more about Beer's Law and FTIR spectroscopy: https://www.mt.com/global/en/home/products/L1_AutochemProducts/ReactIR/ftir-spectroscopy.html?GLO_YT_Autochem_OTH_Youtube_Autochem

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