Involving velocity, pressure, density and temperature as functions of space and time. Fluid Mechanics - The study of fluids - liquids and gases.U 100☏ = Saybolt Universal viscosity at 100☏ in Saybolt Universal seconds equivalent to kinematic viscosity in centiStokes at temperature t (☏)ĭownload and print Kinematic Viscosity Unit Converting Chart U t = Saybolt Universal viscosity at temperature t (☏) Saybolt Universal Viscosity at temperatures other than 100 or 210 oFĪt temperatures other than 100 or 210☏, convert kinematic viscosity to Saybolt Universal viscosity with Note! Viscosity conversions are based on fluids with specific gravity of one. Check ASTM D 2161 "Standard Practice for Conversion of Kinematic Viscosity to Saybolt Universal Viscosity or to Saybolt Furol Viscosity"Ģ) Water at 68.4 oF (20.2 oC) has an absolute viscosity of one - 1 - centiPoise. In Table 2, we present most common units for viscosity and the conversion factors between them.1) The Saybolt Universal SUS viscosity equivalent (SSU or SUS) to a given kinematic viscosity varies with the temperature at which the determination is made. Note that 1 cm 2/s is equivalent to 100 cSt. However, due to the viscosity values of most common fluids, square centimeters per second (cm 2/s) is used more often. The SI unit for kinematic viscosity is square meters per second (m 2/s).
One stoke is equivalent to one poise divided by the density of the fluid in g/cm 3. Kinematic viscosity is often measured in the CGS unit centistokes (cSt), which is equivalent to 0.01 stokes (St). You guessed it! This one is named after Irish mathematician Sir George Gabriel Stokes (1819-1903) who, among other contributions to fluid mechanics, helped develop the Navier-Stokes equation for the conservation of momentum. Viscosity of Common Fluids Units for Kinematic Viscosity However, since the viscosity of most fluids is below 1 Pa-s (See Table 1), the millipascal-second (mPa-s) is often used instead. You can always check our application library to find examples of different fluids and their viscosity. The SI unit for dynamic viscosity η is the Pascal-second (Pa-s), which corresponds to the force (N) per unit area (m 2) divided by the rate of shear (s -1). It is not a coincidence that the viscosity of distilled water at 20☌ was used to define 1 cP! In order to give you an idea of the viscosity of some conventional fluids we have collected their viscosities in Table 1. This unit is used in honor of French physicist, Jean Léonard Marie Poiseuille (1797-1869), who worked with Gotthilf Hagen on the widely known Hagen-Poiseuille law which applies to laminar flow through pipes. The most commonly used unit for dynamic viscosity is the CGS unit centipoise (cP), which is equivalent to 0.01 Poise (P). In this page we briefly discuss the most common units for the two main types of viscosity: dynamic and kinematic. To further complicate things, different applications might use different unit systems such as SI, CGS. Sometimes it can be confusing since there are several types of viscosity, each with their own units. We get asked about the units of viscosity all the time.
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