Any material interposed between two surfaces that reduces the friction or wear, or both, between them.

Can be liquid, solid (grease) or gaseous (air).

Important characteristics:

See also: Black Oils, Compounded Oil, Corrosion Inhibitor, Dropping Point, Extreme Pressure Lubricants, Foam Inhibitor, Food Grade Lubricants, Friction, Grease, Hypoid Gear Lubricant, Molybdenum Disulphide, Neutralization Number, Oil Detergent, Pour Point, Water Lubricant.

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Subjects: Mechanical Engineering