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Table of critical temperatures of substances
Table shows critical temperatures of various chemical substances.

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liquids

SubstanceMolecular formulaCritical temperature
[°C]
acetone(CH3)2CO235
ethanolC2H5OH240
benzeneC6H6288.94
chloroformCHCl3260

alcohols

SubstanceMolecular formulaCritical temperature
[°C]
ethanolC2H5OH240

other inorganic

SubstanceMolecular formulaCritical temperature
[°C]
ammoniaNH3-132.4
phosphinePH352
argonAr-122.4
nitrogenN2-147.1
heliumHe-267.9
kryptonKr-63.8
xenonXe16.6
neonNe-228.7
ozoneO3-5

gases

SubstanceMolecular formulaCritical temperature
[°C]
ammoniaNH3-132.4
methaneCH4-82.5
carbon dioxideCO231
hydrogen chlorideHCl51.4
hydrogen jodideHI150.8
hydrogen sulfurideH2S100.4
ethene (ethylene)C2H49.5
nitrogen (II) oxideNO-94
phosphinePH352
sulfur (IV) oxideSO2157.3
chlorineCl2144
hydrogenH2-239.9
oxygenO2-118.8
steamH2O374.2
vinyl chloride (chloroethene)CH2CHCl187.2
nitrogenN2-147.1
fluorineF2-101
heliumHe-267.9
kryptonKr-63.8
xenonXe16.6
neonNe-228.7
ozoneO3-5

hydrocarbons

SubstanceMolecular formulaCritical temperature
[°C]
methaneCH4-82.5
ethene (ethylene)C2H49.5
benzeneC6H6288.94

oxides

SubstanceMolecular formulaCritical temperature
[°C]
carbon dioxideCO231
carbon monoxideCO-140.2
nitrogen (II) oxideNO-94
sulfur (IV) oxideSO2157.3

inorganic acids

SubstanceMolecular formulaCritical temperature
[°C]
hydrogen bromideHBr90
hydrogen chlorideHCl51.4
hydrogen jodideHI150.8
hydrogen sulfurideH2S100.4

other organic

SubstanceMolecular formulaCritical temperature
[°C]
chloroformCHCl3260
vinyl chloride (chloroethene)CH2CHCl187.2

halogens

SubstanceMolecular formulaCritical temperature
[°C]
chlorineCl2144
fluorineF2-101

Some facts

  • Critical temperature is the temperature above which the density of the substance in the gas and liquid state becomes identical.
  • After reaching the critical temperature condensation of the gas becomes impossible.
  • The critical temperature is specific for given substance. For example, the critical temperature of hydrogen (H2) is -240.17 °C.

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