Videos Design Manufacture Only emails and answers are saved in our archive. On this page, we examine the viscosity of a gas. In short, air velocity in the ducts is calculated by dividing airflow by duct cross-section. This method has largely been replaced by the kinematic viscosity method. Pressure Testing with Air Versus Pressure Testing with Water Calculators | Widman International SRL inertial forces to viscous To calculate the viscosity of a liquid, you'll need a ball, the liquid itself, and a graduated cylinder. This calculator allows calculating kinematic viscosity at 40C from the known VI and kinematic viscosity of the oil at 100C: The common equation used to calculate the viscosity by interpolation between two reference points is with the Ubbelohde-Walther equation, which is adopted in ASTM D341. The Mollier diagram is a graphic representation of the relationship between air temperature, moisture content and enthalpy - and is a basic design tool for building engineers and designers. See also Air Composition and molecular weight, Density at varying pressure, Diffusion Coefficients for Gases in Air, Dynamic (absolute) and kinematic viscosity, Prandtl Number, Specific heat at varying temperature and Specific heat at varying pressure,Thermal Conductivity,Thermal Diffusivity, Properties at gas-liquid equilibrium conditions and Air thermophysical properties, for other properties of air.For other substances, see Density and specific weight of acetone, ammonia, argon, benzene, butane, carbon dioxide, carbon monoxide, ethane, ethanol, ethylene, helium, hydrogen, methane, methanol, nitrogen, oxygen, pentane, propane, toluene and water, as well as Density of crude oil, Density of fuel oils, Density of lubricating oil and Density of jet fuel as function of temperature. Convert Customer Gas Flow Rate unit of measure to a standard unit of measure for air flow (SCFM or SCCM). Specific weight is the ratio of the weight to the volume of a substance: = (m * g)/V = * g [2]. Absolute or dynamic viscosity is used to calculateReynold's Number to determine if a fluid flow is laminar, transient or turbulent.

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