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I am currently working on a project which involves compressing air at high pressures and temperatures. I spent hours having a look for a pressure and temperature dependent equation for the dynamic viscosity of air but the only ones I could find were all temperature dependent only, such as the Sutherland Equation.

Does anybody knows of such equations ?

I would be looking for an equation fit to cover the ranges from 1 to 450 bars and 0 to 150 degrees Celsius.

Thank you for your help.