 flow chemic react ga mixtur flow chemic react ga mixtur suitabl form equat flow inviscid non-heat-conduct ga chemic reaction occur deriv effect mass diffus non-equilibrium intern mode molecul neglect special attent speed sound ga mixtur gener express ratio frozen equilibrium sound speed deduc exampl ideal dissoci ga signific veloc defin ratio convect deriv pressur densiti explain veloc exist throat converg-diverg duct maximum mass flow condit veloc depend nozzl geometri well 'reservoir' condit illustr phenomena sound absorpt dispers discuss ideal dissoci ga concis express term frozen equilibrium sound speed frequenc harmon sound vibrat characterist time rate progress reaction 