Beer's Law, also known as the Beer-Lambert Law, is a linear relationship between the absorbance of light by a solution and the concentration of the absorbing species in that solution. The law is commonly expressed as:
\[ A = \varepsilon \cdot l \cdot c \]
where: - \( A \) is the absorbance, - \( \varepsilon \) is the molar absorptivity, - \( l \) is the path length of the sample cell, - \( c \) is the concentration of the solution.
