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Reynolds Number

Absolute Viscosity

The calculator below can be used if the absolute (dynamic) viscosity of a fluid is known.

Default values for air in Imperial units.

density (kg/m3, lbm/ft3)
velocity (m/s, ft/s)
hydr. diameter (m, ft)
absolute (dynamic) viscosity (N.s/m2, lbm/s.ft)

Kinematic Viscosity

The calculator below can be used if the kinematic viscosity of a fluid is known.

Default values for water in SI units.

velocity (m/s, ft/s)
hydr. diameter (m, ft)
kin. visc. (m2/s, ft2/s))

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