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The quantity kind \(\textit{Electric Conductivity}\) 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.
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