![]() Kinematic Viscosity nK = 1 Centistoke (cSt) = 1 mm 2 /s The symbol for viscosity is denoted by the Greek letter 'eta'. Kinematic viscosity is measured in centistokes (cSt) and one centistoke equals one millimetre squared per second. A fluid's resistance to flow is known as kinematic viscosity and this is the measurement that is of greatest concern to people using lubricants. ![]() It is a measure of the oil's thickness thick oil has a high viscosity while thin oil has a low viscosity. ![]() This is defined as the oil's resistance to flow at a specified temperature. The most important property of an oil is its viscosity. The classifications, which include ISO, SAE, API, CCMC, SABS, JAMA and ISLS, are each followed by a series of numbers and letters detailing either the viscosity of the oil or its performance properties. When purchasing a can, drum or tankerful of oil, it is important to realise that a number of international classification systems are used to describe the product and its uses. Oil classifications either describe viscosity or performance. This article was first published in 2001.
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