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The resistivity of any material is the resistance of a piece of material having unit lenght and unit sectional area. The symbol is ρ and the unit is the Ohm meter. The resistivity of a material is not usually constant but depends on the temperature.

Table below shows the resistivity (with its reciprocal, conductivity) of the more usual metals and alloys
Table Resistivity of any material at 20 °C
Material Resistivity (Ohm meter) Conductivity (Siemens per meter)
Silver 1.64 x 10-8 6.10 x 107
Copper (annealed) 1.27 x 10-8 5.8 x 107
Gold 2.4 x 10-8 4.17 x 107
Aluminium (hard) 2.82 x 10-8 3.55 x 107
Tungsten 5.0 x 10-8 2.0 x 107
Zinc 5.95 x 10-8 1.68 x 107
Brass 6.6 x 10-8 1.52 x 107
Nickel 6.9 x 10-8 1.45 x 107
Platinum 11.0 x 10-8 9.09 x 106
Tin 11.15 x 10-8 8.7 x 106
Iron 10.15 x 10-8 9.85 x 106
Steel 19.9 x 10-8 5.03 x 106
German silver 16-40 x 10-8 6.3-2.5 x 106
Platinoid 34.4 x 10-8 2.91 x 106
Manganin 44.0 x 10-8 2.27 x 106
Gas carbon 0.0005 200
Silicon 0.06 16.7
Gutta-percha 2 x 107 5 x 10-8
Glass (soda-lime) 5 x 109 2 x 10-10
Ebonite 2 x 1013 5 x 10-14
Porcelain 2 x 1013 5 x 10-14
Sulphur 4 x 1013 2.5 x 10-14
Mica 9 x 1013 1.1 x 10-14
Paraffin-wax 3 x 1016 3.3 x 10-17

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