Cell Constant:

The conductivity of an electrolytic solution is given by Equation:

k = 1 / (R * l * a)

For a given cell, the ratio of separation (l) between the two electrodes divided by the area of cross-section (a) of the electrode is called the cell constant. Thus,

Cell Constant = l / a

The SI unit of cell constant is m^-1, which is conveniently expressed in cm^-1. Equation (5.14) then becomes

k = cell constant / R