How is the viscosity of a gas related to the pressure and temperature? We know that for ideal gases viscosity is independent of the pressure and this approximation applies for real gases too. I need to find a relation between the viscosity of a gas (specifically argon) and the temperature. Most of the online sources provide data for viscosity at a particular pressure but I am working with rarified flow conditions, so pressure is very low for my work? Can I use the values of viscosity at atmospheric pressure for my rarified flow case at a particular temperature?
Have you checked the following paper:Article Viscosity and Thermal Conductivity Equations for Nitrogen, O...
You can quickly estimate argon viscosity and there is a list of experimental data as well.
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