Which of the following is used as a lubricant?

Which of the following is used as a lubricant?

  1. A. Graphite
  2. B. Silica
  3. C. Iron Oxide
  4. D. Diamond

A. Graphite
Graphite is best suited for lubrication in air. Water vapor is a necessary component for graphite lubrication. The adsorption of water reduces the bonding energy between the hexagonal planes of the graphite to a lower level than the adhesion energy between a substrate and the graphite.

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