Resistivity of any material

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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