The reciprocal of specific resistance or resistivity is called specific conductance or conductivity.
If ρ is the resistivity then,
conductivity = \(\frac{1}{resistivity}\) = \(\frac{1}{ρ}\)
Conductivity is denoted by κ (kappa), where κ = \(\frac{1}{ρ}\)
It is the conductance of a conductor that is 1m in length and 1m2 in cross section area in SI units.
(In C.G.S. units, it is the resistance of a conductor that is 1 cm in length and 1 cm2 in cross section area.)
It is the conductance of a conductor of volume 1m3
(or in C.G.S. units, the volume of 1 cm3).
