What is the viscosity index of lubricating oil?
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Viscosity index (VI) is an arbitrary measure for the change of viscosity with variations in temperature.The lower the VI, the greater the change of viscosity of the oil with temperature and vice versa. It is used to characterize viscosity changes with relation to temperature in lubricating oil.
The viscosity of liquids decreases as temperature increases. The viscosity of a lubricant is closely related to its ability to reduce friction. Generally, the least viscous lubricant which still forces the two moving surfaces apart is desired. If the lubricant is too viscous, it will require a large amount of energy to move (as in honey); if it is too thin, the surfaces will come in contact and friction will increase.
The viscosity of liquids decreases as temperature increases. The viscosity of a lubricant is closely related to its ability to reduce friction. Generally, the least viscous lubricant which still forces the two moving surfaces apart is desired. If the lubricant is too viscous, it will require a large amount of energy to move (as in honey); if it is too thin, the surfaces will come in contact and friction will increase.
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Explanation:
According the ASTM standard, viscosity index is: —an arbitrary number used to characterize the variation of the kinematic viscosity of a petroleum product with temperature. Mathematically, viscosity index represents a relative measure of a lubricants temperature-viscosity behavior with respect to two reference oils.
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