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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 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 (lb_m/ft s, centipoises)	13.4 10^-6, 0.02
Sound velocity in gas (m/s)	1015
Specific Heat - c_p - (Btu/lb^oF or cal/g^oC, J/kgK)	1.24, 5188
Specific Heat Ratio - c_p/c_v	1.66
Gas constant - R - (ft lb/lb^oR, 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, ^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:

Density and specific weight

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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Related Topics

Material Properties - Material properties of gases, fluids and solids - densities, specific heats, viscosities and more.

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