Question
What is specific conductance or conductivity?
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Answer
The reciprocal of specific resistance or resistivity is called specific conductance or conductivity.
If $\rho$ is the resistivity then,
$\text { conductivity }=\frac{1}{\text { resistivity }}=\frac{1}{\rho}$
Conductivity is denoted by $k$ (kappa), where $k =\frac{1}{\rho}$
It is the conductance of a conductor that is $1 m$ in length and $1 m ^2$ 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 $1 cm ^2$ in cross section
area.) It is the conductance of a conductor of volume $1 m ^3$ (or in C.G.S. units, the volume of $1 cm ^3$ ).
If $\rho$ is the resistivity then,
$\text { conductivity }=\frac{1}{\text { resistivity }}=\frac{1}{\rho}$
Conductivity is denoted by $k$ (kappa), where $k =\frac{1}{\rho}$
It is the conductance of a conductor that is $1 m$ in length and $1 m ^2$ 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 $1 cm ^2$ in cross section
area.) It is the conductance of a conductor of volume $1 m ^3$ (or in C.G.S. units, the volume of $1 cm ^3$ ).
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