Cell constant is a term used in the field of conductivity measurements. It is defined as the ratio of the distance between the electrodes divided by the area of cross-section of the electrode. The cell constant is a multiplier constant specific to a conductivity sensor. The measured current is multiplied by the cell constant to determine the electrical conductivity of the solution. The unit of cell constant is m^-1 or cm^-1. The cell constant of a conductivity cell is the ratio of the distance between the electrodes of the cell to their surface area.