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Table 2 Relative narcotic strength of a number of gases [12,22]

From: Moving in extreme environments: inert gas narcosis and underwater activities

  Solubility in solvent at 37°C (mg/ml)  
Gas Water Fat Relative narcotic potency
Helium (He) 0.009 0.015 0.2 (least narcotic)
Hydrogen (H2) 0.017 0.036 0.6
Nitrogen (N2) 0.013 0.067 1
Argon (Ar) 0.027 0.140 2.3
Xenon (Xe) 0.085 1.700 25.6 (most narcotic)
Oxygen (O2) 0.022 0.11 1.7
Carbon dioxide (CO2) 0.838 1.34 20.0