Absorbance/Transmittance Unit Converter

A transmittance to absorbance reference table of values can be found here.

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What is the Beer Lambert Law?

The Beer Lambert law, which is also referred to as Beer’s Law, describes the relationship among absorbance (A), the molar solute concentration in M (c), and the length of the path the light takes to get to the sample in centimeters (l). Absorbance is directly proportional to concentration and length: A = εcl. ε is the wavelength-dependent molar absorbtivity coefficient and it is constant for a particular substance. ε has units of L mol – 1 cm – 1. The Beer’s law provides a linear relationship between concentration and absorbance that can be plotted to produce an easy-to-use graph.

Beer Lambert Calculator

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