Cryogenic Fluids and Liquefied Gas Properties | MEPKit Engineering Tools

Gas	Symbol	Density at NPT (lb/ft³)	Boiling Point at 1 atm (°F)	Vapor Density at BP (lb/ft³)	Liquid Density at BP (lb/ft³)	Heat of Vaporization (Btu/lb)	Critical Temperature (°F)	Critical Pressure (psia)
Helium	He	0.0103	-452.1	1.06	7.62	8.8	-450.3	33.2
Hydrogen	H2	0.0052	-423.2	0.084	4.37	193	-400.3	187.7
Methane	CH4	0.0415	-258.2	0.111	26.46	219.2	-116.5	673.1
Nitrogen	N2	0.0724	-320.4	0.288	50.41	85.2	-232.8	492.3
Oxygen	O2	0.0827	-297.4	0.296	71.27	91.7	-181.1	736.9
Fluorine	F2	0.0982	-306.6		94.2	74.1	-200.2	808.3

Gas

Symbol

Density at NPT (lb/ft³)

Boiling Point at 1 atm (°F)

Vapor Density at BP (lb/ft³)

Liquid Density at BP (lb/ft³)

Heat of Vaporization (Btu/lb)

Critical Temperature (°F)

Critical Pressure (psia)

Helium

0.0103

-452.1

1.06

7.62

8.8

-450.3

33.2

Hydrogen

0.0052

-423.2

0.084

4.37

193

-400.3

187.7

Methane

CH4

0.0415

-258.2

0.111

26.46

219.2

-116.5

673.1

Nitrogen

0.0724

-320.4

0.288

50.41

85.2

-232.8

492.3

Oxygen

0.0827

-297.4

0.296

71.27

91.7

-181.1

736.9

Fluorine

0.0982

-306.6

94.2

74.1

-200.2

808.3

Conversion Factors

1 lb/ft³ = 16.018 kg/m³
1 psi = 6894.8 Pa
1 Btu/lb = 2326 J/kg

Normal Temperature and Pressure (NTP)

NTP is defined as 14.696 psia at 70°F.

Applications

Cryogenic services involve the handling of liquefied gases at temperatures between -150°F to -450°F. These extremely low temperatures are used in various industrial applications including:

Rocket propulsion (liquid hydrogen and oxygen)
Industrial gas separation and liquefaction
Superconductivity research and applications
Medical applications (liquid nitrogen for cryotherapy)
Food preservation and freezing