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Viscosity is defined scientifically as a force multiplied by a time divided by an area. Thus its SI units are newton-seconds per square meter, or pascal-seconds. [1] Viscosity quantifies the internal frictional force between adjacent layers of fluid that are in relative motion. [1]
The SI unit of viscosity is the pascal second (Pa·s) or kg·m −1 ·s −1. The SI unit of kinematic viscosity is square metre per second or m 2 /s. CGS Unit of Viscosity. The cgs unit of viscosity is poise (P), which has been used in honour of French physiologist Jean Léonard Marie Poiseuille.
The unit of viscosity, accordingly, is newton -second per square metre, which is usually expressed as pascal -second in SI units. The viscosity of liquids decreases rapidly with an increase in temperature, and the viscosity of gases increases with an increase in temperature.
The poise (symbol P; / pɔɪz, pwɑːz /) is the unit of dynamic viscosity (absolute viscosity) in the centimetre–gram–second system of units (CGS). [1] . It is named after Jean Léonard Marie Poiseuille (see Hagen–Poiseuille equation). The centipoise (1 cP = 0.01 P) is more commonly used than the poise itself.
Viscosity is a physical quantity that describes a fluid’s resistance to flow. It is a property that resists the relative displacement of the different layers of the fluid. It can be considered as the fluid friction occurring inside the fluid due to the internal friction between the molecules.
The SI units for dynamic (absolute) viscosity is given in units of N·S/m 2, Pa·S, or kg/(m·s), where N stands for Newton and Pa for Pascal. Poise are metric units expressed as dyne·s/cm 2 or g/(m·s).
The SI unit for dynamic viscosity η is the Pascal-second (Pa-s), which corresponds to the force (N) per unit area (m2) divided by the rate of shear (s-1). Just as in the definition of viscosity!
The SI unit of viscosity is the pascal second [Pa s], which has no special name. Start with the definition of viscosity… The units on the right side of this equation are, in the numerator… [N/m 2 = Pa] …and in the denominator… [m/s × 1/m = 1/s] …which together are…
The SI unit for viscosity is newton-second per square meter (N·s/m 2). However, you’ll often see viscosity expressed in terms of pascal-second (Pa·s), kilogram per meter per second (kg·m −1 ·s −1 ), poise (P or g·cm −1 ·s −1 = 0.1 Pa·s) or centipoise (cP).
This is the SI unit of viscosity, equivalent to newton-second per square metre (N·s m–2). It is sometimes referred to as the “poiseuille” (Pl). One poise is exactly 0.1 Pa·s. One poiseuille is 10 poise or 1000 cP, while. 1 cP = 1 mPa·s (one millipascal-second).