![]() The lower the VI, the more the viscosity is affected by changes in temperature. It is mostly used to characterize the viscosity-temperature behavior of lubricating oils. By using a VI calculator, engineers can make informed decisions about the type and quality of lubricant to use, which can help to prolong the lifespan of machinery and reduce maintenance costs. The viscosity index ( VI) is an arbitrary, unit-less measure of a fluid's change in viscosity relative to temperature change. They are also used by automotive manufacturers to determine the appropriate lubricants for their engines. ![]() The individual curves are due to shearing alone, while the spacing between the lines is the temperature effect on viscosity. Viscosity can be impacted by both shear and temperature. Viscosity index calculators are used extensively in the petroleum industry to ensure that lubricants can perform consistently in a wide range of temperatures. Both the power-law coefficient and the consistency index must be considered to calculate viscosity. This means that oils with a high VI will maintain their lubrication properties even at high temperatures. The higher the VI, the less the change in viscosity with temperature change. The VI calculator works by comparing the viscosity of the oil at two different temperatures, typically 40☌ and 100☌. ![]() It is an important parameter in determining the quality and performance of lubricants. Viscosity index (VI) calculator is a tool used to measure the rate of change in the viscosity of oil with changes in temperature.
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