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...Ix compressible flow is the study of fluids flowing at speeds comparable to local speed sound this occurs when fluid are about or more acoustic velocity then density no longer remains constant throughout field typically does not occur with but can easily in gases two important and distinctive effects that flows choking where limited by sonic condition becomes equal shock waves introduce discontinuities properties highly irreversible since there now four dependent variables be determined these pressure temperature new have been introduced additional equations required for a complete solution energy equation state must solved simultaneously continuity momentum determine all ideal gas used analyze isentropic first describe low relative critical high second applies experiencing adiabatic frictionless p rt r t absolute respectively air most commonly incurred o its ft s m k useful volume specific heats defined as c du dh v dt u internal h enthalpy treated constants analyzing elemental values...