Beer–Lambert Law

Relates the attenuation of monochromatic light passing through a homogeneous absorbing medium to the absorber concentration and path length, commonly expressed as A = ε · b · c (absorbance A, molar absorptivity ε, path length b, concentration c).

The Beer–Lambert Law (also Beer's Law) relates the absorbance A of monochromatic light passing through a homogeneous, non‑scattering medium to the concentration c of an absorbing species and the path length l by A = ε·l·c, where ε is the molar absorptivity (extinction coefficient) at the specified wavelength; it applies under conditions of linearity, non‑interacting absorbers and negligible scatte