why graphite is used in lubricants
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Graphite has one carbon atom covalently bonded to three other carbon atoms, forming a giant hexagonal molecular structure with layers held by weak Van der Waals' forces. As the Van der Waals' forces between the layers are weak, the layers can easily slide over each other when pressured and is soft. Thus, it can be used as a lubricant.
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The interactions known as london dispersion forces between the layers which were separated by a distance of 3.35 A are weakened by the presence of water molecule so that it is easy to cleave graphite.For this reason graphite is used as lubricant.
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