![]() ![]() For higher viscosities, SSF (Saybolt Seconds Furol) is used. This is the time for 60 ml of fluid to flow through the calibrated orifice of a Saybolt Universal viscometer at a Kinematic viscosity specified temperature, as prescribed by test method ASTM D 88. It is most usually encountered as the centistokes (cSt) (= 0.01 stokes). One stokes is equal to the viscosity in poise divided by the density of the fluid in g cm–3. This is the cgs unit, equivalent to square centimetre per second. Kinematic viscosity units Stokes (symbol: St) One poiseuille is 10 poise or 1000 cP, while 1 cP = 1 mPa It is sometimes referred to as the “poiseuille” (Pl). This is the SI unit of viscosity, equivalent to newton-second per square metre (N Many everyday fluids have viscosities between 0. Even in relation to high-viscosity fluids, this unit is most usually encountered as the centipoise (cP), which is 0.01 poise. 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. Poise (symbol: P) 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.
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