# 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 10^{7} |

Copper (annealed) | 1.27 x 10^{-8} | 5.8 x 10^{7} |

Gold | 2.4 x 10^{-8} | 4.17 x 10^{7} |

Aluminium (hard) | 2.82 x 10^{-8} | 3.55 x 10^{7} |

Tungsten | 5.0 x 10^{-8} | 2.0 x 10^{7} |

Zinc | 5.95 x 10^{-8} | 1.68 x 10^{7} |

Brass | 6.6 x 10^{-8} | 1.52 x 10^{7} |

Nickel | 6.9 x 10^{-8} | 1.45 x 10^{7} |

Platinum | 11.0 x 10^{-8} | 9.09 x 10^{6} |

Tin | 11.15 x 10^{-8} | 8.7 x 10^{6} |

Iron | 10.15 x 10^{-8} | 9.85 x 10^{6} |

Steel | 19.9 x 10^{-8} | 5.03 x 10^{6} |

German silver | 16-40 x 10^{-8} | 6.3-2.5 x 10^{6} |

Platinoid | 34.4 x 10^{-8} | 2.91 x 10^{6} |

Manganin | 44.0 x 10^{-8} | 2.27 x 10^{6} |

Gas carbon | 0.0005 | 200 |

Silicon | 0.06 | 16.7 |

Gutta-percha | 2 x 10^{7} | 5 x 10^{-8} |

Glass (soda-lime) | 5 x 10^{9} | 2 x 10^{-10} |

Ebonite | 2 x 10^{13} | 5 x 10^{-14} |

Porcelain | 2 x 10^{13} | 5 x 10^{-14} |

Sulphur | 4 x 10^{13} | 2.5 x 10^{-14} |

Mica | 9 x 10^{13} | 1.1 x 10^{-14} |

Paraffin-wax | 3 x 10^{16} | 3.3 x 10^{-17} |

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