Lambert-Beer law

The Lambert-Beer law determines absorbance, a quantity characterizing the absorption of electromagnetic radiation in a substance.

Absorbance depends on the thickness of the $$d$$ layer, where the radiation is attenuated, and on the absorption coefficient $$\alpha$$ (attenuation), which depends on intensity.



A = \alpha \cdot d $$

We substitute Beer's law into this formula, where $$\varepsilon$$ is the molar absorption coefficient and $$C$$ is the molar concentration of the solution:



\alpha = \varepsilon \cdot C $$

We thus obtain the Lambert-Beer law:


 * $$A = \epsilon \cdot C \cdot d\!$$

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