In linear-sweep voltammetry and related techniques, the empirical quantity defined by the equation \[\frac{i_{p}}{A\ \sqrt{\nu}\ c_{\text{B}}}\quad \left(=\frac{j_{p}}{\sqrt{\nu}\ c_{\text{B}}}\right)\] where ip is the peak current, A is the area of the electrode-solution interface, ν is the rate of change of applied potential, and cB is the bulk concentration of the substance B whose reduction or oxidation is responsible for the peak in question.