It can be seen that:
1 W m = 100 W cm or 1 W cm = 0 01 W m
The inverse of resistance, R, is called conductance, G, and we have
the relation:
G = 1
R = ρ
A=κ
A
l
l
(2 18)
The SI unit of conductance is siemens, represented by the symbol
‘S’ and is equal to ohm–1 (also known as mho) or W–1 The inverse of
resistivity, called conductivity (specific conductance) is represented by
the symbol, k (Greek, kappa)