1. The problem statement, all variables and given/known data Air enters aone-inlet, one-exit contreol volume at 6 bar, 500K and 30m/s through a flow area of 28cm3. At the exit the pressure is 3 bar, the temperature is 456.5 K and the velocity is 300 m/s. The air behaves as an ideal gas. For steady state operation determine a) the mass flow rate, in kg/s b) the exit flow area, in cm3 2. Relevant equations m' = dm/dt = ρvA 3. The attempt at a solution I have the area of the cross section, A, and the velocity at both ends, but I'm not sure about the ρ. Can I use: ρ = p/RT to find the air density?