That molecular property of a fluid which enables it to support tangential stresses for a finite time and thus to resist deformation; the ratio of shear stress divided by shearing strain. A measure of the internal friction within a fluid. The time required for a liquid to drain out of a capillary tube is directly proportional to its viscosity.

The tangential force, F, required to move a layer of fluid, with viscosity, μ and area, A, at a constant velocity, v, for a given perpendicular distance from an immovable surface, s, is given by:

Force required to move a layer of viscous fluid with a constant velocity

1 P (poise)=0.1 Nsm-1 1 P=1 gcm-1s-1
1 cP (centipoise)=10-3 kgm-1s-1 1 cP=1 mNsm-2
1 lb ft-1 h-1=0.4132 mNsm-2 1 slug ft-1s-1=47.88 Nsm-2
1 Reyn=1 lbf s in-2 1 Reyn=6895 Nsm-2

The kinematic viscosity of a fluid is the dynamic viscosity of a fluid divided by the fluid density.
ν = kinematic viscosity [m2s-1]
μ = dynamic viscosity [Nsm-2]
ρ = density [kgm-3]
Click on an item to paste into clipboard or use clipboard symbol at end to clipboard all values
Acetic Acid 0.001219 Nsm-2Clip
Acetone 0.000324 Nsm-2Clip
Acetylene 0.00000935 Nsm-2Clip
Ammonia 0.00000918 Nsm-2Clip
Argon 0.000021 Nsm-2Clip
Benzene 0.000647 Nsm-2Clip
Bromine 0.000993 Nsm-2Clip
Carbon Dioxide 0.000014 Nsm-2Clip
Carbon Disulphide 0.000375 Nsm-2Clip
Carbon Monoxide 0.0000166 Nsm-2Clip
Carbon Tetrachloride 0.000972 Nsm-2Clip
Chlorine 0.0000129 Nsm-2Clip
Chloroform 0.000569 Nsm-2Clip
Cyanogen 0.00000928 Nsm-2Clip
Ethylene 0.0000097 Nsm-2Clip
Glycerol 1.495 Nsm-2Clip
Helium 0.0000186 Nsm-2Clip
Hydrogen 0.00000835 Nsm-2Clip
Hydrogen Chloride 0.0000138 Nsm-2Clip
Hydrogen Sulphide 0.0000117 Nsm-2Clip
Mercury Hg 0.001552 Nsm-2Clip
Methane 0.0000103 Nsm-2Clip
Methyl Alcohol 0.000594 Nsm-2Clip
Nitric Oxide 0.0000178 Nsm-2Clip
Nitrobenzene 0.00203 Nsm-2Clip
Nitrous Oxide 0.0000135 Nsm-2Clip
Olive Oil 84 Nsm-2Clip
Oxygen 0.0000192 Nsm-2Clip
Paraffin Oil 1 Nsm-2Clip
Phenol 0.01274 Nsm-2Clip
Sulphur Dioxide 0.0000117 Nsm-2Clip
Toluene 0.000585 Nsm-2Clip
Turpentine 0.00149 Nsm-2Clip
Water 0.001 Nsm-2Clip
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See also: Brookfield Viscosity, Density, Electroviscosity, Fluid Friction, Friction, Inviscid, Kinematic Viscosity, Melt Flow Index, Newtonian Fluid, Non-Newtonian Fluid, Pascal Second, Poise, Pour Point, Reyn, Saybolt Universal Viscosity, Stokes, Superfluidity, Viscosity Grade, Viscous.

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Subjects: Aerodynamics Fluid Dynamics