if given enough heat will diamond melt into liquid like glass why or why not ?
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Diamond is one form of carbon. And it is metastable at room temperature and pressure. Which means it “shouldn’t exist” (rather, it can’t form by itself, and would “fall apart” – turn into graphite, another form of carbom, if it could). If you just heat it up it will turn into graphite. Rather, it would, but if you heat it up in air, it’ll burn, turn into carbon dioxide, and nothing will be left.
And you can’t really get liquid “diamond”. You can melt it but it will be indistinguishable from molten graphite. But to get liquid carbon, you need to heat it up under a lot of pressure. And it can’t be in pressurised air, because it will burn. It can’t be under pure nitrogen either, carbon reacts with it as well. What you need is at least around 5000K and 100 atmosperes to have liquid carbon. And I’m not sure how you would achieve that practically.
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