E = Absorbance x Liter Moles x cm E differs from K (Specific extinction Coefficient) by a factor of molecular weight. UNITS A = ECL A = No unit (numerical number only) E = Liter Cm x MoleE = Absorbance x Liter Moles x cm E differs from K (Specific extinction Coefficient) by a factor of molecular weight. UNITS A = ECL A = No unit (numerical number only) E = Liter Cm x Mole