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Kinematic Viscosity
is the ratio of absolute or dynamic viscosity to density - a quantity in which no force is involved. Kinematic viscosity can be obtained by dividing the absolute viscosity of a fluid with its mass density as
ν = μ / ρ (2)
where
ν = kinematic viscosity
μ = absolute or dynamic viscosity
ρ = density
In the SI-system the theoretical unit is m2/s or commonly used Stoke (St) where
• 1 St = 10-4 m2/s
Since the Stoke is an unpractical large unit, it is usual divided by 100 to give the unit called Centistokes (cSt) where
• 1 St = 100 cSt
• 1 cSt = 10-6 m2/s
Since the specific gravity of water at 68.4oF (20.2oC) is almost one - 1, the kinematic viscosity of water at 68.4oF is for all practical purposes 1.0 cSt.