Kinematic viscosity, strictly speaking, is defined as the ratio of absolute viscosity to density.ĭensity is a mass-derived property, and because mass and weight are, for practical purposes, proportional anywhere on the surface of Earth, kinematic viscosity is often interpreted as the fluid's resistance to flow under forces of gravity. Put more simply, the thicker the fluid, the more energy that is needed to get it to flow. In this column, I'll explain the differences between them, and give a few tips on how to apply them to lubricating fluids.Ībsolute viscosity is defined as a fluid's resistance to shear, or the fluid's resistance to deform when subjected to a force. The two ways of measuring and reporting viscosity, kinematic and absolute (also known as dynamic), often cause confusion in the minds of those who work with them on a less-than-regular basis.
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