Definitions for viscosity index
vis·cos·i·ty in·dex

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1. Viscosity index

   The viscosity index (VI) is an arbitrary, unit-less measure of a fluid's change in viscosity relative to temperature change. It is mostly used to characterize the viscosity-temperature behavior of lubricating oils. The lower the VI, the more the viscosity is affected by changes in temperature. The higher the VI, the more stable the viscosity remains over temperature fluctuations. The VI was originally measured on a scale from 0 to 100; however, advancements in lubrication science have led to the development of oils with much higher VIs.The viscosity of a lubricant is closely related to its ability to reduce friction in solid body contacts. Generally, the least viscous lubricant which still forces the two moving surfaces apart to achieve "fluid bearing" conditions 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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1. Viscosity index

   Viscosity index is an arbitrary measure for the change of viscosity with temperature. It is used to characterize lubricating oil in the automotive industry. 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; if it is too thin, the surfaces will come in contact and friction will increase. As stated above, the Viscosity Index highlights how a lubricant's viscosity changes with variations in temperature. Many lubricant applications require the lubricant to perform across a wide range of conditions: for example, in an engine. Automotive lubricants must reduce friction between engine components when it is started from cold as well as when it is running. The best oils will not vary much in viscosity over such a temperature range and therefore will perform well throughout. The VI scale was set up by the Society of Automotive Engineers. The temperatures chosen arbitrarily for reference are 100 and 210 °F. The original scale only stretched between VI=0 and VI=100 but since the conception of the scale better oils have also been produced, leading to VIs greater than 100.

How to pronounce viscosity index?

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How to say viscosity index in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of viscosity index in Chaldean Numerology is: 4

2. Pythagorean Numerology

   The numerical value of viscosity index in Pythagorean Numerology is: 8

References

1. ^ Wikipedia
   https://en.wikipedia.org/wiki/Viscosity_Index
2. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=viscosity index