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1. A substance that has a high thermal conductivity. Metals are good conductors on account of the high concentration of free electrons they contain. Energy is transmitted through a metal predominantly by means of collisions between electrons and ions. Most nonmetals are poor conductors (good thermal insulators) because there are relatively few free electrons.

2. A substance that has a high electrical conductivity. Again conduction results from the movement of free electrons. See energy bands.

Subjects: Physics.

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