The property of a solid or fluid medium which allows the medium to conduct a form of energy; e.g., conductivity or thermal conductivity. In well logging, presently, the conventional use of the term means electrical con. Conductivity, which is the reciprocal of electrical [[resistivity]]. Usually expressed as the reciprocal of ohm-meters × {{:terms:p22f1.gif}} , or {{:terms:p22f2.gif}}.