87.2 Conductivity and its application 1. Some concepts For metals: I For electrolyte solution: Ohm’sLaw U R: resistance. electric conductance(G): R Definition: G= I/R I Unit: Ohm, Q2 Unit: Q-I. mho. Siemens. S o: resistivity Reciprocal of resistance R A Unit: Q2-m conductivity(x: nition:K=l/p Unit: m1. Some concepts For metals: I U R = R: resistance, Unit: Ohm,  A l R =  : resistivity Unit: ·m Ohm’s Law For electrolyte solution: Reciprocal of resistance electric conductance (G) : Definition: G = 1/R Unit: -1 , mho, Siemens, S conductivity () : Definition:  = 1/  Unit: S·m-1 §7.2 Conductivity and its application