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Diamond melts or vaporizes above about 4000 deg C. If the pressure is high enough it is liquid, if lower it is a gas. If heated in air diamond will burn above about 850 deg. C becoming carbon dioxide also a gas.

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14y ago

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Why does a diamond turn into coal when it's burned?

When a diamond is burned, it does not turn into coal. Instead, it undergoes combustion and forms carbon dioxide gas, leaving behind a small amount of ash residue. Coal is a completely different substance that forms over millions of years from plant matter undergoing pressure and heat.


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