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Helium - Thermophysical Properties

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Chemical, physical and thermal properties of Helium - He :
(values at 25 oC (77 o F, 298 K) and atmospheric pressure)

Helium - Thermophysical Properties
Molecular Weight 4.0026
Specific Gravity , air = 1 0.138
Specific Volume ( ft 3 /lb, m 3 /kg ) 97.86, 6.11
Density of liquid at atmospheric pressure ( lb/ft 3 , kg/m 3 ) 7.80, 125
Absolute Viscosity ( lb m /ft s, centipoises ) 13.4 10-6 , 0.02
Sound velocity in gas ( m/s ) 1015
Specific Heat - c p - ( Btu/lb o F or cal/g oC, J/kgK ) 1.24, 5188
Specific Heat Ratio - c p /c v 1.66
Gas constant - R - ( ft lb/lb o R, J/kg oC ) 386, 2077
Thermal Conductivity ( Btu/hr ft o F, W/m oC ) 0.086, 0.149
Boiling Point - saturation pressure 14.7 psia and 760 mm Hg - ( o F, o K ) -452, 4.22
Latent Heat of Evaporation at boiling point ( Btu/lb, J/kg ) 10.0, 23300
Critical Temperature ( o F, o K ) -450.3, 5.2
Critical Pressure ( psia, MN/m2 ) 33.22, -
Critical Volume ( ft 3 /lb, m 3 /kg ) 0.231, 0.0144
Flammable no

Follow the links below to get values for the listed properties of helium at varying pressure and temperature :

See also more about atmospheric pressure , and STP - Standard Temperature and Pressure & NTP - Normal Temperature and Pressure ,
as well as Thermophysical properties of: Acetone , Acetylene , Air , Ammonia , Argon , Benzene , Butane , Carbon dioxide , Carbon monoxide , Ethane , Ethanol , Ethylene , Hydrogen , Hydrogen sulfide , Methane , Methanol , Nitrogen , Oxygen , Pentane , Propane , Toluene , Water and Heavy water, D2O .

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