I'm running a Flow Simulation model where I want to change the density of the project fluid, which is air.   It appears that in the Engineering database I can modify the molecular mass, the specific heat, dynamic viscosity and thermal conductivity, but I don't see how to enter a different density for example, simulating air a 30,000 ft.   Maybe I'm missing something very obvious, or too accustomed to using Flotherm where the density of the working fluid is very easy to change.

Thanks,

Dave