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C i c ^ A one-dimensional theory based upon fundamental flow relationships ^ is presented for analyzing the behavior of one or more gas streams flowing MM through a single nozzle. This conpound-coropressible flow theory shows that f^ the behavior of each stream is influenced by the presence of the other ^^ streams. The theory also shows that the behavior of coiTpound--coiTpressible flow is predicted by determining how changing conditions at the nozzle exit plane affect conditions within the nozzle. It is found that, vAien choking of the compound-conpressible flow nozzle occurs, an interesting phenomenon exists. The conpound-corrpressible flow is shown to be choked at the nozzle throat, although the individual stream Mach numbers there are not equal to one. This phenomenon is verified by a wave analysis which shows that, when choking occurs, a pressure v^ve cannot be propagated upstream to the nozzle throat even though soma of the individual streams have Mach numbers less than one. Algebraic methods based on this ccarpound-conpressible flow theory are used to demonstrate the usefulness of this approach in confuting the behavior of aatpound-conpressible flcx^ nozzles. A corrparison of the confxxind-carpr^ sible flow theory with three-dimensional carfuter calculations shows that the effects of streamline curvature on nozzle behavior can be disregarded for many practical nozzle configurations. Test results from a typical two-flow nozzle show excellent agreement with the predictions from the theory.