Dynamic viscosity may also be expressed in the metric CGS (centimeter-gram-second) system as g/ (cm s), dyne s/cm2 or poise (p) where. This technical brief was supplied by Hydramotion. In the SI system the dynamic viscosity units are N s/m2, Pa s or kg/ (m s) - where.
This is the ratio of the time of fl ow of 200 ml of fl uid to the time of fl ow of 200 ml of water at the same temperature in a standardized Engler viscosity meter.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 specifi ed 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. 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 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.
