CBSE Class 12 · 2007 · All India · Redox Reactions and ElectrochemistryShort Answer

Electrical conductivity ($\kappa$): the conductance of a solution of 1 cm length and 1 cm${}^2$ cross-section — i.e. the conductance of a unit cube of the solution; it is the reciprocal of resistivity. Units: S cm${}^{-1}$.
Molar conductivity (${\Lambda }_m$): the conductance of that volume of solution which contains one mole of the electrolyte, kept between two electrodes of unit area of cross-section a unit distance apart:

Units: S cm${}^2$ mol${}^{-1}$.