Table of critical pressures of substances
Tables show values of critical pressures specified for various chemical substances.

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Unit (critical pressure)
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liquids#

SubstanceMolecular formulaCritical pressure
[MPa]
acetone(CH3)2CO4.7
ethanolC2H5OH9.9
benzeneC6H64.9
chloroformCHCl35.5

alcohols#

SubstanceMolecular formulaCritical pressure
[MPa]
ethanolC2H5OH9.9

other inorganic#

SubstanceMolecular formulaCritical pressure
[MPa]
ammoniaNH311.15
phosphinePH36.5
argonAr4.8
nitrogenN23.35
heliumHe0.23
kryptonKr5.4
xenonXe5.8
neonNe2.7
ozoneO39.2

gases#

SubstanceMolecular formulaCritical pressure
[MPa]
ammoniaNH311.15
methaneCH44.6
carbon dioxideCO27.3
hydrogen chlorideHCl8.3
hydrogen sulfurideH2S8.9
ethene (ethylene)C2H45.1
nitrogen (II) oxideNO6.4
phosphinePH36.5
sulfur (IV) oxideSO27.78
chlorineCl27.6
hydrogenH21.3
oxygenO24.97
steamH2O21.8
vinyl chloride (chloroethene)CH2CHCl5.2
nitrogenN23.35
fluorineF25.5
heliumHe0.23
kryptonKr5.4
xenonXe5.8
neonNe2.7
ozoneO39.2

hydrocarbons#

SubstanceMolecular formulaCritical pressure
[MPa]
methaneCH44.6
ethene (ethylene)C2H45.1
benzeneC6H64.9

oxides#

SubstanceMolecular formulaCritical pressure
[MPa]
carbon dioxideCO27.3
carbon monoxideCO3.45
nitrogen (II) oxideNO6.4
sulfur (IV) oxideSO27.78

inorganic acids#

SubstanceMolecular formulaCritical pressure
[MPa]
hydrogen bromideHBr8.4
hydrogen chlorideHCl8.3
hydrogen sulfurideH2S8.9

other organic#

SubstanceMolecular formulaCritical pressure
[MPa]
chloroformCHCl35.5
vinyl chloride (chloroethene)CH2CHCl5.2

halogens#

SubstanceMolecular formulaCritical pressure
[MPa]
chlorineCl27.6
fluorineF25.5

Some facts#

  • Critical pressure is the pressure below which it is not possible to carry out condensation of gas at a critical temperature.
  • Critical pressure is specific for a given substance. For example, the critical pressure of hydrogen (H2) is approximately 1.3 MPa, i.e. 13 atmospheres.

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