Teragon's Summary of Cryogen Properties

Every effort has been made to ensure the accuracy of the following data.
If you find an error, or have a suggestion, please report it here.
Some useful conversions are given after the table of properties.

Cryogen	Property	Value	Units	Comments
Nitrogen N₂	Boiling Point	77.348	K	1 Atm
	Melting Point	63.2	K	1 Atm
	Triple Point	63.2	K	triple point temperature
	Triple Point	0.127	Atm	triple point pressure
	Critical Point	126.19	K	critical point temperature
		33.534	Atm	critical point pressure
		0.31311	g/ml	critical point density
	Density	0.80663	g/ml	liquid, 1 Atm, @ boiling point
	Dielectric Constant	1.434		liquid, 1 Atm, @ boiling point
	Latent Heat	198.3	kJ/kg	vaporization @ 1 Atm
Ammonia NH₃	Boiling Point	239.82	K	1 Atm
	Melting Point	195.5	K	1 Atm
	Triple Point	195.49	K	triple point temperature
	Triple Point	6.06	kPa	triple point pressure
	Critical Point	405.40	K	critical point temperature
		111.85	Atm	critical point pressure
		0.22500	g/ml	critical point density
	Density	0.68197	g/ml	liquid, 1 Atm, @ boiling point
	Dielectric Constant	22		liquid, 1 Atm, @ boiling point
	Latent Heat	1369	kJ/kg	vaporization @ 1 Atm
Argon Ar	Boiling Point	87.3	K	1 Atm
	Melting Point	83.8	K	1 Atm
	Triple Point	83.8	K	triple point temperature
	Triple Point	0.679	Atm	triple point pressure
	Critical Point	150.7	K	critical point temperature
		48.3	Atm	critical point pressure
		0.544	g/ml	critical point density
	Density	1.403	g/ml	liquid, 1 Atm, @ boiling point
	Dielectric Constant	1.520		liquid, 1 Atm, @ boiling point
	Latent Heat	161.6	kJ/kg	vaporization @ 1 Atm
Carbon Dioxide CO₂	Sublimation Point	194.7	K	1 Atm
	Triple Point	216.6	K	triple point temperature
	Triple Point	5.12	Atm	triple point pressure
	Critical Point	304.21	K	critical point temperature
		72.878	Atm	critical point pressure
		0.46650	g/ml	critical point density
	Density	1.563	g/ml	subliming solid @ 1 Atm
	Latent Heat	573	kJ/kg	subliming solid @ 1 Atm
Helium 4 ⁴He	Boiling Point	4.2304	K	1 Atm
	Lambda Point	2.18	K	lambda point temperature
	Lambda Point	0.050	Atm	lambda point pressure
	Critical Point	5.1953	K	critical point temperature
		2.2449	Atm	critical point pressure
		0.069641	g/ml	critical point density
	Density	0.12473	g/ml	liquid, 1 Atm, @ boiling point
	Dielectric Constant	1.049		liquid, 1 Atm, @ boiling point
	Latent Heat	20.73	kJ/kg	vaporization @ 1 Atm
Helium 3 ³He	Boiling Point	3.19	K	1 Atm
	Critical Point	3.35	K	critical point temperature
	Critical Point	1.15	Atm	critical point pressure
	Density	0.059	g/ml	liquid, 1 Atm, @ boiling point
	Latent Heat	8.48	kJ/kg	vaporization @ 1 Atm
Hydrogen e-H₂	Boiling Point	20.27	K	1 Atm
	Melting Point	14.0	K	1 Atm
	Triple Point	13.81	K	triple point temperature
	Triple Point	0.0695	Atm	triple point pressure
	Critical Point	32.98	K	critical point temperature
		12.76	Atm	critical point pressure
		0.0314	g/ml	critical point density
	Density	0.0708	g/ml	liquid, 1 Atm, @ boiling point
	Dielectric Constant	1.230		liquid, 1 Atm, @ boiling point
	Latent Heat	446	kJ/kg	vaporization @ 1 Atm
Methane CH₄	Boiling Point	111.67	K	1 Atm
	Melting Point	90.7	K	1 Atm
	Triple Point	88.7	K	triple point temperature
	Triple Point	0.099	Atm	triple point pressure
	Critical Point	190.56	K	critical point temperature
		45.391	Atm	critical point pressure
		0.16266	g/ml	critical point density
	Density	0.42236	g/ml	liquid, 1 Atm, @ boiling point
	Dielectric Constant	1.676		liquid, 1 Atm, @ boiling point
	Latent Heat	511.5	kJ/kg	vaporization @ 1 Atm
Neon Ne	Boiling Point	27.10	K	1 Atm
	Melting Point	24.58	K	1 Atm
	Triple Point	24.56	K	triple point temperature
	Triple Point	0.427	Atm	triple point pressure
	Critical Point	44.49	K	critical point temperature
		26.44	Atm	critical point pressure
		0.482	g/ml	critical point density
	Density	1.204	g/ml	liquid, 1 Atm, @ boiling point
	Dielectric Constant	1.188		liquid, 1 Atm, @ boiling point
	Latent Heat	86.2	kJ/kg	vaporization @ 1 Atm
Oxygen O₂	Boiling Point	90.188	K	1 Atm
	Melting Point	54.4	K	1 Atm
	Triple Point	54.4	K	triple point temperature
	Triple Point	0.0015	Atm	triple point pressure
	Critical Point	154.58	K	critical point temperature
		49.771	Atm	critical point pressure
		0.43614	g/ml	critical point density
	Density	1.1412	g/ml	liquid, 1 Atm, @ boiling point
	Dielectric Constant	1.487		liquid, 1 Atm, @ boiling point
	Latent Heat	212.9	kJ/kg	vaporization @ 1 Atm

In the following tables of conversion factors, horizontal groups (rows) are equivalent.
For example, 1 atm = 101.325 kPa = 14.696 PSIA, etc.

Pressure

atm kPa PSIA bar torr

1 101.325 14.696 1.01325 760

Density

g/ml g/cm³ kg/m³ lb/ft³

1 1 1000 62.428

Temperature

K  =  °C + 273.15  =  ((°F - 32) / 1.8) + 273.15  =  °R / 1.8

°C  =  K - 273.15  =  (°F - 32) / 1.8  =  (°R / 1.8) - 273.15

°F  =  (1.8 x (K - 273.15)) + 32  =  (1.8 x °C) + 32  =  °R - 459.67

°R  =  (1.8 x K)  =  1.8 x (°C + 273.15)  =  °F + 459.67

Energy

kJ BTU cal

1 0.94782 239.01

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