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Hydrogen, H2
Categories: Fluid; Pure Element

Material Notes: Physical Form: Colorless Gas; Flammable

Key Words: H2
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Physical PropertiesOriginal ValueComments
Density 0.0000820 g/ccGas
Molecular Weight 2.016 g/molH2
Vapor Pressure 0.09869 atm
@Temperature -258.6 °C
 
Chemical PropertiesOriginal ValueComments
Atomic Mass 1.0078251H
 1.00794Natural Abundance - 1995
 2.0141022H (Deuterium, D)
 3.0160493H (Tritium, T)
Atomic Number 1
Critical Pressure 12.76 atm
Critical Temperature -240.18 °C
Critical Density 0.0310 g/cc
Critical Molar Volume 65.0 cm³/mol
Electronegativity 2.2Pauling
Ionic Radius 1.54 ÅCrystal Ionic Radius for Valence -1
 
Electrical PropertiesOriginal ValueComments
Dielectric Constant 1.228
@Temperature -253 °C
20.4 K
 
Thermal PropertiesOriginal ValueComments
Heat of Fusion 59.5 J/gEnthalpy of fusion at normal melting point
Heat of Vaporization 446.4 J/gEnthalpy of vaporization at normal boiling temperature
Specific Heat Capacity 14.29 J/g-°CGas
Thermal Conductivity 0.0686 W/m-K
@Pressure 0.000 MPa,
Temperature -173 °C
gas; low pressure limiting value
 0.1869 W/m-K
@Pressure 0.000 MPa,
Temperature 26.9 °C
gas; low pressure limiting value
 0.2304 W/m-K
@Pressure 0.000 MPa,
Temperature 127 °C
gas; low pressure limiting value
Melting Point -259.34 °CAt atmospheric pressure (760 torr)
Boiling Point -252.87 °C
Heat of Formation 0.000 kJ/molGas
 
Optical PropertiesOriginal ValueComments
Refractive Index 1.1096
@Temperature -253 °C
Liquid
 
Component Elements PropertiesOriginal ValueComments
Hydrogen, H 100 %
 
Descriptive Properties
CAS Number1333-74-0
SolubilitySlightly Soluble in H2O

References for this datasheet.

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AMEH0 / 41

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