Conductance

$\sigma =\frac{1}{\rho }$

• $\rho$ is the Resistivity of the material

$\sigma =\frac{nf\lambda q^2}{2m{v}_{\text{thermal}}}$

• Conductance of a wire
• $n$ is the number of molecules per unit volume
• $f$ is the number of free electrons per molecule
• $\lambda$ is the average distance between collisions of electrons with nuclei