![]() 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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