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...Me compressible fluid flow i basic thermodynamics the compressibility refers to change of density introduction can due a in pressure or temperature liquid is very weak function and but it perceptibly with gas strong ii iii applications vast complex subject steam turbines under some cases we treat purely based rocket nozzles on thermodynamic laws mass energy c engine ports however concepts momentum conservation combustion chambers needed at places which shall consciously minimise re entry vehicles liquids hydraulic penstocks high circuits normally only transient that calls for analysis gases both steady may call consider an arbitrary control volume as shown let us mv through crosses flowing from ducts same p t yellow cv time fills out m v e mcv portion inlet duct aim be convert newton s second law exit system cm now look two snapshots one other iv subtracting above equations get dp f dt b dividing sides by then shrinking state if put equation words write ssecond implies rate su...