Gases - Critical Temperatures and Pressures

Critical temperatures and pressures for some common gases - air, alcohol, ether, oxygen and more

  • A substance can not exist as a liquid above the Critical Temperature
  • The pressure of saturated vapor at critical temperature is the Critical Pressure
GasCritical temperatureCritical pressureBoiling temperature
(oF) (oC) (psi, lb/sq.in) (bar) (oF) (oC)
Air -220.9 -140.5 547 37.71 - -
Ammonia (NH3) 270 132.4 1636 112.8 -27.4 -33
Argon 705.6
Butane 550.4
Carbon-dioxide (CO2) 87.8 31 1071.6 73.8 -110 -79
Carbon-monoxide (CO) -220.5 -140.3 507.5 35 -310 -190
Chlorine 1118.7
Dowtherm A 465
Ethane 708
Ethylene 735
Fluorine 808.5
Helium 33.2
Hydrogen (H) -400 -240 188.2 13 -423 -253
Hydrogen Chloride 1198
Isobutane 529.2
Isobutylene 580
Methane 673.3
Nitrogen (N) -232.6 -147 492.4 34 -321 -195
Nitrous Oxide 1047.6
Oxygen (O2) -155 -118.6 736.5 50.4 -297 -183
Phosgene 823.2
Propane 617.4
Propylene 670.3
Refrigerants
Water 3206.2

Related Topics

  • Gas and Compressed Air - Gas properties, capacities of pipelines, sizing of relief valves - air, LNG, LPG and more

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