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 fluid above the Critical Temperature
  • The pressure of saturated vapor at critical temperature is the Critical Pressure
Gas Critical temperature Critical pressure Boiling 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
Carbon-dioxide (CO2) 87.8 31 1070 73.8 -110 -79
Carbon-monoxide (CO) -220.5 -140.3 508 35 -310 -190
Hydrogen (H) -400 -240 189
13 -423 -253
Nitrogen (N) -232.6 -147 493 34 -321 -195
Oxygen (O2) -155 -118.6 731 50.4 -297 -183

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