1. n. [Drilling Fluids]

A unit of measurement for viscosity, symbolized by P. Viscosity is the ratio of shear stress to shear rate, giving the traditional unit of dyne-sec/cm2 for poise. In metric (SI) units, 1 P is 0.1 Pa.s (pascal-second).

See related terms: apparent viscosity,  centipoise,  power-law fluid,  rheology,  yield