conductivity, γ,σ

Reciprocal of resistivity. This quantity is a tensor in an anisotropic medium. It was formerly called specific conductance.
Source:
Green Book, 2nd ed., p. 15
PAC, 1996, 68, 957 (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 967