title: Calibration of condenser microphones under increased atmospheric pressures.
mesh_terms: D000162:Acoustics; D000669:Amplifiers, Electronic; D018504:Ecological Systems, Closed; D004581:Electronics / Q000295:instrumentation*; D006371:Helium; D006931:Hyperbaric Oxygenation; D009584:Nitrogen; D010100:Oxygen; D011312:Pressure; D014159:Transducers
chemical_list: D006371:Helium; D009584:Nitrogen; D010100:Oxygen