A more exact kinematic viscosity for water at 20.2 o C (68.4 o F) is 1.0038 mm 2 /s (cSt). The specific gravity for water at 20.2 o C (68.4 o F) is almost one, and the kinematic viscosity for water at 20.2 o C (68.4 o F) is for practical purpose 1.0 mm 2 /s ( cStokes). 1 cSt (centiStoke) = 10 -6 m 2 /s = 1 mm 2 /s.Since the Stoke is a large unit it is often divided by 100 into the smaller unit centiStoke (cSt) - where Stoke comes from the CGS (Centimetre Gram Second) unit system. In the SI-system the theoretical unit of kinematic viscosity is m 2 /s - or the commonly used Stoke (St) where Μ = absolute or dynamic viscosity (N s/m 2 ) Kinematic viscosity can be obtained by dividing the absolute viscosity of a fluid with the fluid mass density like Kinematic viscosity is the ratio of - absolute (or dynamic) viscosity to density - a quantity in which no force is involved. Absolute or Dynamic Viscosity of common Liquids.Absolute (Dynamic) Viscosity - Online Converter.Water at 20.2 o C (68.4 o F) has the absolute viscosity of one - 1 - centiPoise. 1 cP = 0.01 poise = 0.01 gram per cm second = 0.001 Pascal second = 1 milliPascal second = 0.001 N s/m 2.1 poise = 1 dyne s/cm 2 = 1 g/(cm s) = 1/10 Pa s = 1/10 N s/m 2įor practical use the Poise is normally too large and the unit is therefore often divided by 100 - into the smaller unit centipoise (cP) - where.1 Pa s = 1 N s/m 2 = 1 kg/(m s) = 0.67197 lb m /(ft s) = 0.67197 slug /(ft s) = 0.02089 lb f s/ft 2ĭynamic viscosity may also be expressed in the metric CGS (centimeter-gram-second) system as g/(cm s), dyne s/cm 2 or poise (p) where.In the SI system the dynamic viscosity units are N s/m 2, Pa s or kg/(m s) - where (1) can be rearranged to express Dynamic viscosity as Μ = dynamic viscosity of fluid (N s/m 2 )Įquation (1) is known as the Newtons Law of Friction. The shearing stress between the layers of a non turbulent fluid moving in straight parallel lines can be defined for a Newtonian fluid as Dynamic (absolute) viscosity is the tangential force per unit area required to move one horizontal plane with respect to an other plane - at an unit velocity - when maintaining an unit distance apart in the fluid. There are two related measures of fluid viscosityĪbsolute viscosity - coefficient of absolute viscosity - is a measure of internal resistance. viscosity is the measure of a fluid's resistance to flow.The shear resistance in a fluid is caused by inter-molecular friction exerted when layers of fluid attempt to slide by one another. The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress. Viscosity is an important fluid property when analyzing liquid behavior and fluid motion near solid boundaries.
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