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Cauchy Equation

Describes the relationship between absorbance and concentration for solutions of absorbing species, fundamental to quantitative analysis.

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The statement of the theorem

The Beer-Lambert Law relates the measured absorbance

A

to the concentration

c

of the absorbing species, the path length

l

of the cuvette, and the molar absorptivity

\epsilon

at a specific wavelength

\lambda

A = \epsilon c l

. Here,

A

is unitless,

c

has units of

\text{mol}\cdot\text{L}^{-1}

l

has units of

\text{cm}

, and

\epsilon

has units of

\text{L}\cdot\text{mol}^{-1}\cdot\text{cm}^{-1}

Source: Wikipedia