Upon what quality or characteristic of a lubricating oil is its viscosity index based?
- Its rate of flow through an orifice at a standard temperature.
- Its rate of change in viscosity with temperature change.
- Its resistance to flow at a standard temperature as compared to high grade paraffin base oil at the same temperature.
Explanation
The viscosity index is a numerical measure of how much an oil's viscosity changes as temperature changes. It is based on this rate of change of viscosity with temperature, a high index meaning small change, and is not a single-temperature flow rate or a comparison of flow resistance at one temperature.
Diverdeep asking:
viscosity is defined as mm^2/s for a determined temperature.
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