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Key Terms
Lubricants
A substance (often a liquid) introduced between two moving surfaces to reduce the friction between them, improving efficiency and reducing wear. One of the single largest applications for lubricants, in the form of motor oil, is to protect the internal combustion engines in motor vehicles and powered equipment.
[ en.wikipedia.org/wiki/Lubricant ]
Hydraulic Fluid
The medium by which power is transferred in hydraulic machinery. Examples of equipment that might use hydraulic fluids include excavators, brakes, power steering systems, transmissions, and industrial machinery.
[ en.wikipedia.org/wiki/Hydraulic_fluid ]