The pascal second (symbol Pa·s) is the SI unit of dynamic viscosity. If a fluid with a viscosity of one Pa·s is placed between two plates, and one plate is pushed sideways with a shear stress of one pascal, it moves a distance equal to the thickness of the layer between the plates in one second. One pascal second equals 10 poise. The name "poiseuille" was proposed for this unit, but not accepted. The International System of Units (abbreviated SI from the French phrase, Système International dUnités) is the most widely used system of units. ... The Pitch Drop Experiment at the University of Queensland. ... A subset of the phases of matter, fluids include liquids, gases, plasmas and, to some extent, plastic solids. ... Shear stress is a stress state where the shape of a material tends to change (usually by sliding forces - torque by transversely-acting forces) without particular volume change. ... The pascal (symbol Pa) is the SI unit of pressure. ... The second (symbol s) is a unit for time, and one of seven SI base units. ... The poise (P) is the cgs unit of viscosity, 1 P = 1 g·cm-1·s-1 The SI analog is 1 pascal second (Pa·s) = 1 kg·m-1·s-1 = 10 P. It is named after Jean Louis Marie Poiseuille. ...