(values at 25 o C (77 o F, 298 K) and atmospheric pressure)
|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 o C, J/kgK )||1.24, 5188|
|Specific Heat Ratio - c p /c v||1.66|
|Gas constant - R - ( ft lb/lb o R, J/kg o C )||386, 2077|
|Thermal Conductivity ( Btu/hr ft o F, W/m o C )||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/m 2 )||33.22, -|
|Critical Volume ( ft 3 /lb, m 3 /kg )||0.231, 0.0144|
Follow the links below to get values for the listed properties of helium at varying pressure and temperature :
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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, D 2 O .
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