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Lubrication is the process, or technique employed to
reduce wear of one or both surfaces in close
proximity, and moving relative to each another, by
interposing a substance called lubricant between the
surfaces to carry or to help carry the load
(pressure generated) between the opposing surfaces.
The interposed lubricant film can be a solid, (eg
graphite, MoS2) a solid/liquid dispersion, a liquid,
a liquid-liquid dispersion (greases) or
exceptionally a gas.
In the most common case the applied load is carried
by pressure generated within the fluid due to the
frictional viscous resistance to motion of the
lubricating fluid between the surfaces.
Lubrication can also describe the phenomenon such
reduction of wear occurs without human intervention
(aquaplaning on a road).
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