Discussion
Graphite acts as a solid lubricant because its structure consists of
Answer: A
Correct answer: layers that slide easily over one another
Graphite is built of sheets of covalently bonded carbon held to one another only by weak forces, so the sheets shear apart under a small stress while each remains intact. That anisotropy is the whole of its lubricating action, and it is why the same element in the tetrahedral diamond structure is the hardest substance known.
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