I know you're a chemist so maybe you know if there's more to it.Short version:Carbon in any form will burn in air at above 800C or so, which is withinnormal flame temperatures.Above about 650C diamond actually burns at a slightly lower activationenergy than graphite or amorphous carbon, though the difference is verysmall and temperature-dependent.However diamond and graphite present nearly atomically-smooth surfacesto the air, and amorphous carbon doesn't. On 20/03/14 20:36, David Billington wrote: Peter, I remember an old OU IIRC film and it showed the burning of diamond but they said the activation energy was so high the diamond needed to be heated white hot with the likes of an OA torch and then placed in liquid oxygen where it did burn.
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