A conductor is a substance in which electrons can move freely from one atom to another.
An insulator is a substance in which electrons cannot move from one atom to another.
Common Conductors and Insulators
| Good Conductors | Fair Conductors | Good Insulators (Non-conductors) |
| Silver | Carbon | Oil |
| Copper | Human body | Fur |
| Gold | Moist human skin | Silk |
| Aluminum | Acid solutions | Wool |
| Magnesium | Salt water | Rubber |
| Tungsten | Earth | Porcelain, glass |
| Nickel | Water vapour (in air) | Plastic |
| Mercury | Wood | |
| Platinum | Paper | |
| iron | Wax | |
| ebonite |
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