Distinguish between thick film and boundary film lubrication

The difference between thick film and boundary film lubrication are as follows-

Thick film Boundary film lubrication
It is also known as film or hydrodynamic lubrication. It is also known as thin film lubrication.
In this case, the coefficient of friction ranges from 0.001 to 0.03. In this case, the coefficient of friction ranges from 0.05 to 0.15.
The lubrication should have minimum viscosity. The lubricant should have more oiliness.
The lubricant neither gets absorbed on nor chemically reacts with a metallic surface. The lubricants may be absorbed on or chemically reacts with metallic surfaces
The lubricating oil forms uniform film of a thickness more than 10000A in between two moving or sliding surfaces. TThe lubricating oil forms uniform film of a thickness more than 1000A in between two moving or sliding surfaces.
The oil molecules are disoriented. This lubrication is used in machines working under high load and slow speed.
This lubrication is used in machines working under light and high speed. Bearing, gears, tractor rollers, lathes, railway track joints, concrete mixture etc.

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