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TERMS REL RELATING TING TO THE PETROLEUM INDUSTRY A B C D E F G H I j k L M N O P V VI (Viscosity Index) Viscosity Index is an arbitrary scale used to show the magnitude of viscosity changes in lubricating oils with changes in temperature, the tables found in ASTM Method D 2270 are widely used. Viscosity The measure of the internal friction or the resistance to flow of a liquid. Viscosity Index See VI
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