Graphite, coal and diamonds are all thought to be products of the decay and compression of vegetable matter from millions of years ago. Diamonds progress from coal.
It relates to the Graphite content and the quality of your graphite. for 50% loading, 5W/mK is possible. It increase with increasing the graphite content, for 80% loading might be about 7W/mK. 10W/mK is also attainable for some special kinds of graphite including graphene nanoplatelets.
Yes, it is possible to be allergic to graphite. Graphite allergy is rare but can cause symptoms such as skin irritation or respiratory issues in some individuals who have sensitivities to the substance. If you suspect you are allergic to graphite, it is best to consult with a healthcare provider for proper evaluation and management.
Yes, it is possible to convert diamond into graphite because both are made of pure carbon atoms arranged differently. However, the process of converting diamond to graphite is complex and typically involves high temperatures and pressures. The graphite formed can technically be used in a pencil, but it would be more cost-effective to use natural or synthetic graphite for this purpose.
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Astrobiology
Diamond (and also graphite) is pure carbon, without iron. Heating graphite and subjecting it to intense pressure can make small industrial diamonds.
Graphite itself is pure carbon. But it might be possible for some samples of graphite to contain impurities of lead.
You think probable to graphite.
Graphite mines
Graphite does not have a transparency.
No, graphite is not renewable.
No, graphite is not magnetic.