Chemistry
Advanced

Beer–Lambert Law

Absorbance of light by a solution.

Formula

A=εlcA = \varepsilon l c

Variables

\varepsilonMolar absorptivity
lPath length
cConcentration

Example

Doubling the concentration of a coloured solution doubles its absorbance.

Did You Know?

The Beer–Lambert law lets a colorimeter find a solution's concentration just from how much light it absorbs.

spectroscopyabsorbance