petapoise [PP] Unit Converter

Definition of petapoise [PP] unit

Petapoise (PP) is a unit of dynamic viscosity equal to 10^15 poise in the centimetre–gram–second (CGS) system. Because one poise equals 0.1 pascal-second, one petapoise equals 10^14 pascal-seconds, describing extraordinarily strong resistance to flow.

History of petapoise [PP] unit

The poise belongs to the CGS system of units and honors French physician and physicist Jean Léonard Marie Poiseuille, whose nineteenth-century studies of blood flow helped establish quantitative laws for viscous motion. The unit was standardized as a measure of dynamic viscosity, with one poise defined as one dyne-second per square centimetre. The SI system subsequently adopted the pascal-second, making the poise a non-SI unit, although it remains familiar in fluid science. The prefix peta-, meaning 10^15, was standardized for SI usage in 1975; petapoise therefore denotes extraordinarily large viscosity values.

Applications of petapoise [PP] unit

Petapoise is mainly a theoretical or descriptive scale rather than a routine laboratory unit, because ordinary liquids have vastly smaller viscosities. It can express calculated or modeled resistance in extremely dense materials, highly concentrated suspensions, geological melts, or slowly deforming solids. In practice, scientists usually report such measurements in pascal-seconds, millipascal-seconds, or poise for readability.

Complete list of petapoise [PP] unit conversion