MathLiveBeer-Lambert law
Gives the absorbance of a solution as the base-10 logarithm of the ratio of incident to transmitted light intensity, which is proportional to the molar absorptivity, concentration, and path length. It is the standard relation used in UV-visible spectroscopy to determine concentration from absorbance measurements.
A=\log_{10}\left(\frac{I_0}{I}\right)=\varepsilon c LWhat the symbols mean
| absorbance (dimensionless) | |
| intensity of incident light entering the sample | |
| intensity of light transmitted through the sample | |
| molar absorptivity (L mol$^{-1}$ cm$^{-1}$) | |
| molar concentration of the absorbing species (mol L$^{-1}$) | |
| optical path length through the sample (cm) |
About this formula
- FieldChemistry
- TopicSpectroscopy
- LevelUniversity
- Also calledBeer-Lambert law absorbance, absorbance formula, Beer's law, Lambert-Beer law, UV-Vis absorbance equation, absorbance of a solution
- SourceWikidata Q898426
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