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Why is diamond a bad conductor of electr...

Why is diamond a bad conductor of electricity but a good conductor of heat?

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In diamond, each `C`-atom is `sp^(3)` hybridised and is tetrahedrally bonded to four carbon atoms. Diamond does not have free electrons. Since the conduction of electricity requires the presence of free electrons, diamond is a bad conductor of electricity. But conduction of heat does not require the presence of free electrons, so diamond is a good conductor of heat.
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