It is sometimes called Òextinction coefficientÓ
A wavelength dependent constant for the species being
analyzed
ÒeÓ is also used in some texts for ÒaÓ.ÒaÓ or molar
absorptivity (1/M.cm)
ÒbÓ or path
length (cm)
The diameter of the cuvette or sample holder which is
the
distance the light travels through the absorbing sample. Becomes a constant when the same cuvette is used for all samples
ÒcÓ or concentration (M or mol/L)
Generally the main use of BeerÕs Law is to determine the
concentration
of various solutions