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Table of triple points of substances
Tables show triple points (temperature and pressure) of selected substances i.e. conditions when all three phases (liquid, solid and gas) coexist in thermodynamic equilibrium.

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alcohols

SubstanceMolecular formulaTemperature [K]Pressure [kPa]
ethanolC2H5OH1504.3×10-7

liquids

SubstanceMolecular formulaTemperature [K]Pressure [kPa]
ethanolC2H5OH1504.3×10-7
mercuryHg234.31561.65×10-7
water 25°CH2O273.160.61173
formic acidHCOOH281.412.2
chloroformCHCl3175.430.87

other inorganic

SubstanceMolecular formulaTemperature [K]Pressure [kPa]
ammoniaNH3195.46.076

gases

SubstanceMolecular formulaTemperature [K]Pressure [kPa]
ammoniaNH3195.46.076
argonAr83.805868.9
heliumHe2.195.07
hydrogenH213.80337.04
methaneCH490.6811.7
nitrogenN263.1812.6
carbon dioxideCO2216.55517
hydrogen chlorideHCl158.9613.9
ethaneC2H689.890.0008
n-buthaneC4H10134.60.0007
ethene (ethylene)C2H41040.12
ethyneC2H2192.4120
nitrogen (II) oxideNO109.521.92
nitrogen (I) oxideN2O182.3487.85
sulfur (IV) oxideSO2197.641.67
oxygenO254.35840.152

hydrocarbons

SubstanceMolecular formulaTemperature [K]Pressure [kPa]
methaneCH490.6811.7
ethaneC2H689.890.0008
n-buthaneC4H10134.60.0007
ethene (ethylene)C2H41040.12
ethyneC2H2192.4120

oxides

SubstanceMolecular formulaTemperature [K]Pressure [kPa]
carbon dioxideCO2216.55517
carbon monoxideCO68.115.37
nitrogen (II) oxideNO109.521.92
nitrogen (I) oxideN2O182.3487.85
sulfur (IV) oxideSO2197.641.67

inorganic acids

SubstanceMolecular formulaTemperature [K]Pressure [kPa]
hydrogen chlorideHCl158.9613.9

carboxylic acids

SubstanceMolecular formulaTemperature [K]Pressure [kPa]
formic acidHCOOH281.412.2

other organic

SubstanceMolecular formulaTemperature [K]Pressure [kPa]
chloroformCHCl3175.430.87

halogens

SubstanceMolecular formulaTemperature [K]Pressure [kPa]
jodineI2386.6512.07

Some facts

  • The triple point is the conditions (i.e. pressure and temperature) in which all three phases (gas, liquid and solid) exist in equilibrium.
  • The triple point is specific to the given substance.
  • Some substances do not have a triple point because they do not appear in all three states.

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