This relatively low viscosity allows water to flow easily and is one of the reasons why it is commonly used as a benchmark for viscosity comparisons. Kirchhoff, "Ueber den Einfluss der Wärmeleitung in einem Gase auf die Schallbewegung", Ann. The deviation between the viscosity coefficient of castor oil measured by the new correction method and the standard value is only 0.045. Water: The coefficient of viscosity for water at 20C is approximately 0.001 Pas (pascal-seconds) or 1 centipoise (cP).
Temperature is a factor that affects the viscosity of fluids. The coefficient of viscosity of gases isn't affected by pressure. " On the theories of the internal friction in fluids in motion, and of the equilibrium and motion of elastic solids", Transactions of the Cambridge Philosophical Society, vol.8, 22, pp. viscosity, resistance of a fluid (liquid or gas) to a change in shape, or movement of neighbouring portions relative to one another. Water's coefficient of viscosity decreases with increasing pressure. The relaxation time for water is about 2.0 ×10 −12 seconds (2 picoseconds) per radian, corresponding to an angular frequency ω of 5 ×10 11 radians (500 gigaradians) per second and therefore a frequency of about 3.14 ×10 12 hertz (3.14 terahertz).
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