Helium - Thermophysical Properties
Chemical, physical and thermal properties of Helium - He :
(values at 25 oC (77 oF, 298 K) and atmospheric pressure)
| Molecular Weight | 4.0026 |
| Specific Gravity , air = 1 | 0.138 |
| Specific Volume ( ft3 /lb, m3 /kg ) | 97.86, 6.11 |
| Density of liquid at atmospheric pressure ( lb/ft3, kg/m3 ) | 7.80, 125 |
| Absolute Viscosity ( lbm /ft s, centipoises ) | 13.4 10-6, 0.02 |
| Sound velocity in gas ( m/s ) | 1015 |
| Specific Heat - cp - ( Btu/lb oF or cal/g oC, J/kgK ) | 1.24, 5188 |
| Specific Heat Ratio - cp /cv | 1.66 |
| Gas constant - R - ( ft lb/lb o R, J/kg oC ) | 386, 2077 |
| Thermal Conductivity ( Btu/hr ft oF, W/m oC ) | 0.086, 0.149 |
| Boiling Point - saturation pressure 14.7 psia and 760 mm Hg - ( oF, o K ) | -452, 4.22 |
| Latent Heat of Evaporation at boiling point ( Btu/lb, J/kg ) | 10.0, 23300 |
| Critical Temperature ( oF, o K ) | -450.3, 5.2 |
| Critical Pressure ( psia, MN/m2 ) | 33.22, - |
| Critical Volume ( ft3 /lb, m3 /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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