The Beer-Lambert law, also known as the Beer-Lambert-Bouguer law, relates the absorbance of light to the properties of the material through which the light is passing.
Where:
- is the absorbance of the sample.
- (epsilon) is the molar absorptivity or molar extinction coefficient, a constant characteristic of the substance at a particular wavelength.
- is the concentration of the absorbing species in solution, typically measured in mol/L (molarity).
- is the path length of the sample cell in centimeters, which is the distance the light travels through the sample.