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

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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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