LYCOS RETRIEVER 
Viscosity: Kinematic Viscosity
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The Test Method for Kinematic Viscosity of Transparent and Opaque Liquids is one of the most critical tests in the petroleum industry. It has been used since 1937, yet the method is continually being improved. The technique appears to be quite simple, yet many factors can affect the precision of the measurement. Meeting all the requirements for performing the test method will allow laboratories to meet or exceed the stated precision.
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Viscosity is the measure of a liquid’s resistance to flow. Kinematic viscosity is the ratio of the absolute viscosity to the specific gravity, usually expressed in centistokes (cs), where the resistance to flow is measured in square millimeters per second (mm2/s).
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Viscosity determined as described above is termed the absolute or dynamic viscosity of the fluid. It is normally reported in the units shown in Table 1. Because the dynamic viscosity is a function of the internal friction of the oil, it is frequently specified in bearing designs and oil flow computations. It is often more convenient to measure viscosity using techniques that are dependent on the fluid density, therefore lubricants are often specified by their kinematic viscosity.
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Kinematic Viscosity