lubrication

Introduction
Fluid-film lubrication.
Boundary lubrication.
Solid lubrication.
Control functions.
Other functions.
Liquid, oily lubricants.
Solid lubricants.
Gaseous lubricants.
Viscosity.
Pour point.
Flash point.
Oiliness.
Neutralization number.
Penetration number.

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lubrication summary

Related Questions

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Science Physics

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External Websites

Fact Monster - Science - Lubrication
How Stuff Works - Automobiles - How Car Engines Work

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Articles from Britannica Encyclopedias for elementary and high school students.

lubricant - Student Encyclopedia (Ages 11 and up)

motor oil Motor oil, a lubricant for automobile engines.

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History

lubrication, introduction of any of various substances between sliding surfaces to reduce wear and friction. Nature has been applying lubrication since the evolution of synovial fluid, which lubricates the joints and bursas of vertebrate animals. Prehistoric people used mud and reeds to lubricate sledges for dragging game or timbers and rocks for construction. Animal fat lubricated the axles of the first wagons and continued in wide use until the petroleum industry arose in the 19th...

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