Hey everyone. So I just experimented on compressible flow through a converging diverging nozzle. The nozzle had 8 pressure points from where which pressure was measured, as well as inlet and outlet pressures. The inlet pressure and mass flow rate were adjusted to form subsonic flow and adjusted again to form super sonic flow. I was able to read off pressure values from each pressure point and the mass flow rate too, as well as the inlet and outlet temperatures. My questions are: How do I determine the velocity at each pressure point for the subsonic and super sonic flow parts? I know that subsonic flow obeys Bernoulli's theorem, P1 + pV1^2/2 + pgh1 = P2 + pV2^2/2 + pgh2, so if I was to use that equation to find the velocity at a pressure point then how would I know V1 and V2? Do I just assume V1 is 0 and then calculate V2? As for supersonic flow, how would I find the velocity at each pressure point? I know the density is not constant.