This is the ratio of the time of flow of 200 ml of fluid to the time of flow of 200 ml of water at the same temperature in a standardized Engler viscosity meter. For higher viscosities, SSF (Saybolt Seconds Furol) is used. This is the time for 60 millilitres (ml) of fluid to flow through the calibrated orifice of a Saybolt Universal viscometer at a specified temperature, as prescribed by test method ASTM D 88. It is most usually encountered as the centistokes (cSt), equal to 0.01 stokes. The unit of kinematic viscosity in the centimetre-gram-second (CGS) system, called the stokes in Britain and the stoke in the U.S., is named for the British physicist Sir George Gabriel Stokes. One stokes is equal to the viscosity in poise divided by the density of the fluid in grams per cubic centimetre (g The dimensions of kinematic viscosity are area divided by time the appropriate units are metre squared per second. This is the CGS unit, equivalent to square centimetres per second (cm2 s–1). KINEMATIC VISCOSITY Stokes (symbol: St) + centiStokes (symbol: cSt) TABLE OF EQUIVALENTSġ pound-force second per square inch (reyn) One poiseuille is 10 poise or 1000 cP, while 1 cP = 1 mPa It is sometimes referred to as the poiseuille (symbol Pl). This is the SI unit of viscosity, equivalent to newton-second per square metre (N Pascal-second (symbol: Pa.s) + milliPascal-second (symbol: mPa.s) SOME TYPICAL DYNAMIC VISCOSITIES (cP at 20☌) Many everyday fluids have viscosities between 0. It is the viscosity of a fluid in which a tangential force of 1 dyne per square centimetre maintains a difference in velocity of 1 centimetre per second between two parallel planes 1 centimetre apart.Įven in relation to high-viscosity fluids, this unit is most usually encountered as the centipoise (cP), which is 0.01 poise.
Named after the French physician Jean Louis Marie Poiseuille (1799 – 1869), this is the CGS unit of viscosity, equivalent to dyne-second per square centimetre.
Go to Viscosity Units Converter | Viscosity Comparison ChartĭYNAMIC VISCOSITY Poise (symbol: P) + centiPoise (symbol: cP)
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