Conductance \\(G\\) is the reciprocal of resistance \\(R\\). \\(G = \\frac{1}{R}\\) Dimensions of conductance are \\([M]-1 [L]^{-2}[T]^{3}[I]^{2}\\). While, conductivity \\(\\sigma\\) is the reciprocal of resistivity. \\(\\sigma = \\frac{1}{\\rho}\\) The dimensions of conductivity are \\([M]-1 [L]^{-3}[T]^{3}[I]^{2}\\).