Materials resistivity table
Table shows resistivity values of common materials (substances).

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Unit (resistivity (20°c))
Unit (conductivity (20°c))
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metals

SubstanceMolecular formulaResistivity (20°C)
[Ω × m]
Conductivity (20°C)
[MS × m]
aluminum (pure)Al2.65×10-837.74
copper (pure)Cu1.68×10-859.52
goldAu2.44×10-840.98
ironFe9.7×10-810.31
leadPb2.2×10-74.55
manganeseMn1.44×10-60.69
nickelNi6.99×10-814.31
platinumPt1.06×10-79.43
siliconSi6401.56×10-9
silverAg1.59×10-862.89
tinSn1.09×10-79.17
titaniumTi4.2×10-72.38
tungstenW5.6×10-817.86
zincZn5.9×10-816.95

liquids

SubstanceMolecular formulaResistivity (20°C)
[Ω × m]
Conductivity (20°C)
[MS × m]
mercuryHg9.8×10-71.02
water, sea-0.25×10-6

plastics

SubstanceMolecular formulaResistivity (20°C)
[Ω × m]
Conductivity (20°C)
[MS × m]
rubber, hard-1×10131×10-19

other materials

SubstanceMolecular formulaResistivity (20°C)
[Ω × m]
Conductivity (20°C)
[MS × m]
glass-1×10131×10-19
diamondC1×10121×10-18
graphiteC3×10-53.33×10-2

other inorganic

SubstanceMolecular formulaResistivity (20°C)
[Ω × m]
Conductivity (20°C)
[MS × m]
sulfurS21×10151×10-21

Some facts

  • Resistivity is a property of a given material (substance).
  • Resistivity determines the ability to conduct an electric current. Higher resistivity means, that the material conducts electric current worse.
  • Resistivity is usually marked with a small Greek letter ρ\rho (read as "rho").
  • The basic SI unit of resistivity is ohm times metre:
    Ω×m\Omega \times m
  • If we have a conductor with given dimensions and known material resistivity, then we can calculate its total electric resistance:
    R=ρlAR = \dfrac{\rho \cdot l}{A}
    where:
    • RR - wire resistance as a whole, this value should be shown by an ohmmeter applied to the two ends of the wire,
    • ρ\rho - material resistivity from which the conductor (wire) is made,
    • ll - the length of the wire,
    • AA - cross-sectional area of the conductor (wire).

  • The resistivity, depends on the type of material, but also depends on temperature. The parameter describing how easy given material changes resistance when changing temperature is the temperature coefficient of resistance α\alpha.
  • The temperature coefficient tells us how much the conductor resistance will change when we change the temperature by one Kelvin.
  • If we know the resistance of the conductor at a given temperature (the so-called reference temperature) and we have the temperature coefficient of the material from which that conductor is made, we can calculate its resistance at another temperature:
    RT=R0(1+αΔT)R_T = R_0(1 + \alpha \cdot \Delta T)
    where:
    • RTR_T – wire resistance at temperature TT,
    • R0R_0 – wire resistance at known (reference) temperature T0T_0
    • α\alpha – temperature coefficient of resistance,
    • ΔT\Delta T – temperature change TT0T-T_0 in Kelvins.

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