The figures and tables below shows how water viscosity changes with temperature (☌ and ☏) at water saturation pressure (which for practicle use, gives the same result as atmospheric pressure at temperatures < 100 ☌ (212☏)). See also dynamic and kinematic viscosity of air, ammonia, benzene, butane, carbon dioxide, ethane, ethanol, ethylene, methane, methanol, nitrogen, oxygen and propane. See also other properties of Water at varying temperature and pressure: Boiling points at high pressure, Boiling points at vacuum pressure, Density and specific weight, Enthalpy and entropy, Heat of vaporization, Ionization Constant, pK w, of normal and heavy water, Melting points at high pressure, Prandtl number, Properties at Gas-Liquid Equilibrium Conditions, Saturation pressure, Specific gravity, Specific heat (heat capacity), Specific volume, Thermal conductivity, Thermal diffusivity and Vapour pressure at gas-liquid equilibrium. See Water and Heavy Water - thermodynamic properties. Temperature Choose the actual unit of temperature: Note! Temperature must be within the ranges 0-370 ☌, 32-700 ☏, 273-645 K and 492-1160 °R to get valid values. While the kinematic viscosity is given as cSt, m 2/s, and ft 2/s The output dynamic viscosity is given as cP, mPa*s, Pa*s, N*s/m 2,lb f*s/ft 2 and lb m/(ft*h), The calculator below can be used to calculate the liquid water dynamic or kinematic viscosity at given temperatures. Absolute or dynamic viscosity is used to calculate Reynold's Number to determine if a fluid flow is laminar, transient or turbulent. Dynamic Viscosityĭynamic viscosity determines the shear stress ratio of the fluid to the shear rate.The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress.įor further definitions, go to Absolute (dynamic) and kinematic viscosity. Viscosity has two types that are Dynamic and Kinematic Viscosity. They are synonymous if the fluid density is known.
They define the flow of the fluid in various ways, i.e., how they are measured. There are two different viscosity measures used to describe fluids, dynamics and kinematic viscosities.
Or it can be measured with household equipment, such as calculating how fast a liquid can travel on a slight incline after a certain period of time. Viscosity can be measured by a viscometer, a piece of equipment that measures the force necessary to move through a liquid. As you'll see in this equation, if the spere's speed is lower, the viscosity would be higher. The SI unit of viscosity is Pascal seconds (Pa s). G is the acceleration because of gravity. ?p is the density between the fluid and sphere tested, Where η (eta) is defined as the viscosity,