This quantity varies linearly with respect to the square root of the concentration according to Kohlrausch's law for strong (*) electrolytes, whereas for weak electrolytes, this quantity has a very strong relationship with concentration.
The product of this quantity and viscosity is approximately constant, according to Walden's rule. An experimental determination of this quantity was made by summing cationic and anionic contributions via the law of independent migrations of ions. It's not surface tension, but a sharp dip in this quantity occurs at the critical micelle concentration. The Nernst-Einstein equation relates the diffusion coefficient to this quantity. The inverse of this quantity's limiting type serves as the intercept when plotting the inverse of this value against c times this value, in a visual representation of Ostwald's dilution law. This quantity varies linearly with respect to the square root of the concentration according to Kohlrausch's law for strong (*) electrolytes, whereas for weak electrolytes, this quantity has a very strong relationship with concentration. The units of this quantity are siemens per meter per mole. For 10 points, name this quantity denoted capital lambda, a measure of the efficiency of an electrolyte in solution. 
The product of this quantity and viscosity is approximately constant, according to Walden's rule.
limiting molar conductivity [prompt on lambda; prompt on partial answer]