title: A vacuum chamber for simplifying the collection of expired air samples.
mesh_terms: D001274:Atmospheric Pressure; D002245:Carbon Dioxide / Q000032:analysis; D006801:Humans; D008722:Methods; D010100:Oxygen / Q000032:analysis; D010101:Oxygen Consumption; D012119:Respiration; D013147:Spirometry / Q000295:instrumentation
chemical_list: D002245:Carbon Dioxide; D010100:Oxygen