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Why is graphite used instead of gold or copper wires to conduct electricity in very hot situations such as an industrial kiln?

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The strong bonds give graphite high boiling and melting points, while the weak bonds make graphite soft and flexible.
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Graphite has strong bonds which gives it high boiling and melting points. With a high boiling point and melting points graphite can not melt easily, and thus is why it is preferred in hot situations such as an industrial kiln.