This expression can be put into the following convenient form

with being the specific gas constant, equal to 287 J/(kg.K) for air. Viscosity μ is low, 18.5 uPa·s at (25 °C, 1 bar), and p-dependent.

The following table lists some typical values for air at different pressures at room temperature. Note that different definitions of the molecular diameter, as well as different assumptions about the value of atmospheric pressure (100 vs 101.3 kPa) and room temperature (293.15 vs

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