"Electric Conductivity} or \textit{Specific Conductance" is a measure of a material's ability to conduct an electric current. When an electrical potential difference is placed across a conductor, its movable charges flow, giving rise to an electric current. The conductivity \(\sigma\) is defined as the ratio of the electric current density \(J\) to the electric field \(E\): \(J = \sigma E\). In isotropic materials, conductivity is scalar-valued, however in general, conductivity is a tensor-valued quantity. (http://qudt.org/schema/qudt/LatexString)