viscosity index

listen to the pronunciation of viscosity index
İngilizce - Türkçe
viskozite indeksi

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viscosity index improver
viskozite indeks geliştirici
İngilizce - İngilizce
empirical, unitless number indicating the effect of temperature change on the kinematic viscosity of an oil Liquids change viscosity with temperature, becoming less viscous when heated; the higher the VI of an oil, the lower its tendency to change viscosity with temperature The VI of an oil - with known viscosity at 40°C and at 100°C - is determined by comparing the oil with two standard oils having and arbitrary VI of 0 and 100, respectively, and both having the same viscosity at 100°C as the test oil The following formula is used , in accordance with test method ASTM D 2270
A measure of an oil's ability to resist changes in viscosity when heated
Is a measure of the rate of change of viscosity with temperature Oils with high VI have low viscosity changes (010)
An empirical number indicating the effect of change in temperature on the viscosity of an oil A high viscosity index (VI) signifies a relatively small change of viscosity with temperature Ref ASTM D 2270-64
A measurement of viscosity with a change of temperatures A low VI (example 60) will thin out a lot at high temperatures whereas, a VI of 95 or higher will thin out less Some high grade oils already have naturally occurring high VI's Other VI's can be controlled through refinery processes or VI Improvers can be added
A commonly used measure of a fluid's change of viscosity with temperature The higher the viscosity index, the smaller the relative change in viscosity with temperature
vi
viscosity index

    Heceleme

    vis·cos·i·ty in·dex

    Türkçe nasıl söylenir

    vîskäsıti îndeks

    Telaffuz

    /vəsˈkäsətē ˈəndeks/ /vɪsˈkɑːsətiː ˈɪndɛks/