Molar conductivity

The molar conductivity of an electrolyte solution is defined as its conductivity divided by its molar concentration:

${\displaystyle \Lambda _{\text{m}}={\frac {\kappa }{c}},}$

where

κ is the measured conductivity (formerly known as specific conductance),

c is the molar concentration of the electrolyte.

The SI unit of molar conductivity is siemens metres squared per mole (S m² mol⁻¹). However, values are often quoted in S cm² mol⁻¹. In these last units, the value of Λ_m may be understood as the conductance of a volume of solution between parallel plate electrodes one centimeter apart and of sufficient area so that the solution contains exactly one mole of electrolyte.