The unit of conductivity is siemens per meter (S/m). In some contexts, it may also be expressed in terms of reciprocal ohm-meters (Ω⁻¹·m⁻¹), as conductivity is the inverse of resistivity.
The unit of electrical conductivity is siemens per meter (S/m). In other contexts, you might also encounter the unit of conductance, which is simply siemens (S), but conductivity specifically refers to the conductance per unit length.
