HYD Bosch Fuel Properties calculation > Single component physical properties
Air
The density of the air at standard conditions is:
We first convert the air to the current temperature T [K]:
Equation 8: Density of air at Patm and T
Then we convert it to pressure P by an adiabatic change:
Equation 9: Density of air at P and T
The air is a polytropic fluid, then the bulk modulus of air is:
Source: https://docs.sw.siemens.com/en-US/doc/254352342/PL20250521841123434.amesim_collection.TB118_Bosch_Fuel_Properties/xid1848994 · retrieved 2026-07-17