Resistivity

Resistivity ($\rho$, measured in $\Omega m$) is an electrical material property that relates resistance at fixed temperature with length and cross-sectional area of the material.

$$R=\frac{\rho L}{A}$$

Or alternatively with the electric field and current density:

$$\rho =\frac{\vec{E}}{\vec{J}}$$

See also

• Conductivity, the inverse of resistivity