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Helium - Thermophysical Properties

Chemical, Physical and Thermal Properties of Helium - He

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Chemical, physical and thermal properties of Helium - He :
(values at 25oC (77oF, 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/lboF or cal/goC, J/kgK) 1.24, 5188
Specific Heat Ratio - cp/cv 1.66
Gas constant - R - (ft lb/lboR, J/kgoC) 386, 2077
Thermal Conductivity (Btu/hr ft oF, W/moC) 0.086, 0.149
Boiling Point - saturation pressure 14.7 psia and 760 mm Hg - (oF, oK) -452, 4.22
Latent Heat of Evaporation at boiling point (Btu/lb, J/kg) 10.0, 23300
Critical Temperature (oF, oK) -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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