viscosity grade - significado y definición. Qué es viscosity grade
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Qué (quién) es viscosity grade - definición

MEASURE OF HOW VISCOSITY OF A LIQUID CHANGES WITH TEMPERATURE
Viscosity Index; Viscosity index improver; Viscosity modifiers; Viscosity modifier

SAE J300         
VISCOSITY STANDARD FOR AUTOMOTIVE ENGINE LUBRICANTS
SAE viscosity number; Viscosity grade
SAE J300 is a standard that defines the viscometric properties of mono- and multigrade engine oils, maintained by SAE International. Key parameters for engine oil viscometrics are the oil's kinematic viscosity, its high temperature-high shear viscosity measured by the tapered bearing simulator, and low temperature properties measured by the cold-cranking simulator and mini-rotary viscometer.
Volume viscosity         
Bulk viscosity; Bulk Viscosity; Second Viscosity Coefficient; Second viscosity; Second coefficient of viscosity
Volume viscosity (also called bulk viscosity, or dilatational viscosity) is a material property relevant for characterizing fluid flow. Common symbols are \zeta, \mu', \mu_\mathrm{b}, \kappa or \xi.
Extensional viscosity         
POLYMER SOLUTION PARAMETER
Elongational viscosity
Extensional viscosity (also known as elongational viscosity) is a viscosity coefficient when applied stress is extensional stress.Barnes, H.

Wikipedia

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.