title: A technique for evaluating expired air mixing devices.
mesh_terms: D002245:Carbon Dioxide / Q000032:analysis*; D006801:Humans; D008433:Mathematics; D008722:Methods; D011199:Potentiometry; D011655:Pulmonary Embolism / Q000175:diagnosis; D012121:Respiration, Artificial; D012126:Respiratory Dead Space; D012129:Respiratory Function Tests / Q000295:instrumentation*; D013147:Spirometry
chemical_list: D002245:Carbon Dioxide