Oxygen | Nitrogen | Argon | Hydrogen | Carbon Dioxide | Helium

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Name HELIUM
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Formula He
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CAS Number 7440-59-7
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Molecular Weight 4.003
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Melting point 1.76 K , -271.39 C , -456.5 F
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Boiling point @ 101.325 kPa (1 atm) 4.22 K , -268.93 C , -452.07 F
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Critical Temperature 5.2 K , 267.95 C , -450.31 F
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Critical Pressure 2.28 bar , 2.25 atm , 33.07 psia
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Critical Volume 57.3 cm3/mol
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Critical Density 0.0699 g/cm3
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Critical Compressibility Factor 0.302
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Acentric Factor -0.390
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Density of Liquid @ -270 C 0.139 g/cm3
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Coefficient of thermal Expansion of Liquid @ 25 C 0.0818 1/C
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Surface Tension @ -271 C 0.34 dynes/cm
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Density of Gas @ 1 atm and 70 F (21.1 C) 0.166 kg/m3 , 0.0104 lb/ft3
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Relative Density of Gas @ 1 atm and 70 F (Air =1) 0.138
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Enthalpy of Vaporization @ Boiling Point 19.99 kJ/kg , 8.6 BTU/lb
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Enthalpy of Fusion @ Melting Point 12.49 kJ/kg , 5.37 BTU/lb
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Heat Capacity of Gas @ 25 C , Constant Pressure (CP) 5.193 kJ/(kg K) , 1.241 BTU/(lb R)
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Heat Capacity of Gas @ 25 C , Constant Volume (CV) 3.116 kJ/(kg K) , 0.745 BTU/(lb R)
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Ratio of Heat Capacities for Gas , CP/CV 1.667
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Heat capacity of Liquid @ -270 C 2.47 kJ/(kg K) , 0.59 BTU/(lb R)
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Heat capacity of Solid @ -272 C 1.087 kJ/(kg K ) , 0.26 BTU/(lb R)
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Entropy of Gas @ 25 C 126.04 J/(mol K)
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Entropy of Formation of Gas @ 25 C 0 J/(mol K)
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Enthalpy of Formation of Gas @ 25 C 0 kJ/mol
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Gibbs Energy of Formation of Gas @ 25 C 0 kJ/mol
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Solubility Parameter 1.222 (J/cm3)^0.5
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Liquid Volume 32.257 cm3/mol
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Solubility in Water @ 25 C 1.51 parts per million (wt)
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Octanol-Water Partition Coefficient , log KOW
-
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Henry's Law Constant for Compound in Water @ 25 C 142950.4 atm/mol fraction
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Viscosity of Gas @ 25 C 198.57 micropoise
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Viscosity of Liquid @ -270 C 0.004 centipoise
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Thermal Conductivity of Gas @ 25 C 0.15016 watts/(m K)
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Thermal Conductivity of Liquid @ -270 C 0.016 watts/(m K)
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Lower Explosion Limit in Air
-
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Upper Explosion Limit in Air
-
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Flash Point Temperature
-
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Autoignition Temperature
-
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Enthalpy of Combustion @ 25 C (77 F)
-
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Threshold Limit Value (ACGIH)
-
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Permissible Exposure Limit (OSHA)
-
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Recommended Exposure Limit (NIOSH)
-

 

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