HeliumLung Volume MeasurementsFunctional Residual CapacityTotal Lung CapacityIndicator Dilution TechniquesArgonNitrogen FixationAtmospheric PressureHigh Pressure Neurological SyndromeInert Gas NarcosisNoble GasesPlasma GasesNitrogen IsotopesAir PressureNitrogen CompoundsKryptonNitrogen CycleBlood Urea NitrogenNitrogen DioxideGasesPolyvinyl ChlorideOxygenPneumoperitoneum, ArtificialReactive Nitrogen SpeciesAirNeonBiolisticsNitrogenCarbon DioxideFiresNitrogen OxidesIsotopesHydrostatic PressureSulfur HexafluoridePII Nitrogen Regulatory ProteinsRadioisotope Dilution TechniquePressureHyperbaric OxygenationPlethysmographyLasers, Gas