Electrical resistivity and conductivity

Resistivity
Common symbols	ρ
SI unit	ohm metre (Ω⋅m)
Other units	s (Gaussian/ESU)
In SI base units	kg⋅m3⋅s−3⋅A−2
Derivations from other quantities	${\displaystyle \rho =R{\frac {A}{\ell }}}$
Dimension	${\displaystyle {\mathsf {M}}{\mathsf {L}}^{3}{\mathsf {T}}^{-3}{\mathsf {I}}^{-2}}$

Conductivity
Common symbols	σ, κ, γ
SI unit	siemens per metre (S/m)
Other units	${\displaystyle \mathrm {s} ^{-1}}$ (Gaussian/ESU)
Derivations from other quantities	${\displaystyle \sigma ={\frac {1}{\rho }}}$
Dimension	${\displaystyle {\mathsf {M}}^{-1}{\mathsf {L}}^{-3}{\mathsf {T}}^{3}{\mathsf {I}}^{2}}$

Electrical resistivity (also called volume resistivity or specific electrical resistance) is a fundamental specific property of a material that measures its electrical resistance or how strongly it resists electric current. A low resistivity indicates a material that readily allows electric current. Resistivity is commonly represented by the Greek letter ρ (rho). The SI unit of electrical resistivity is the ohm-metre (Ω⋅m).^[1][2][3] For example, if a 1 m³ solid cube of material has sheet contacts on two opposite faces, and the resistance between these contacts is 1 Ω, then the resistivity of the material is 1 Ω⋅m.

Electrical conductivity (or specific conductance) is the reciprocal of electrical resistivity. It represents a material's ability to conduct electric current. It is commonly signified by the Greek letter σ (sigma), but κ (kappa) (especially in electrical engineering)^{[citation needed]} and γ (gamma)^{[citation needed]} are sometimes used. The SI unit of electrical conductivity is siemens per metre (S/m). Resistivity and conductivity are intensive properties of materials, giving the opposition of a standard cube of material to current. Electrical resistance and conductance are corresponding extensive properties that give the opposition of a specific object to electric current.