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Lubrication
Lubrication is a physical process which allows surfaces to move smoothly against each other. A thin film of lubricant put between the surfaces reduces friction and wear on the surfaces, and keeps temperatures from rising too far. The lubricant film can be a solid/liquid dispersion, a liquid, a liquid-liquid dispersion (a grease) or, exceptionally, a solid or gas.
Examples are the use of oil in machinery, the function of tears in eyes and synovial fluid in joints.
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