Discussion
Put the regimes in order of decreasing film thickness.
1. Extreme pressure lubrication 2. Hydrodynamic lubrication 3. Boundary lubrication
Answer: D
A full oil wedge gives the thickest film, an adsorbed layer a few molecules thick the next, and a reacted inorganic film at the contact spots the thinnest. The governing property changes from viscosity to oiliness to additive chemistry.
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