Basic Hydrogen Properties
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Properties | Value | Units |
|---|---|---|
Auto ignition temperature | 500 | °C |
932 | °F | |
Boiling point (1 atm) | -252.9 | °C |
-423.2 | °F | |
Density NTP | 0.08375 | kg/m³ |
0.005229 | lb/ft³ | |
Diffusion coefficient in air NTP | 0.610 | cm²/s |
6.57 E-4 | ft²/s | |
Enthalpy (NTP) | 3858.1 | kJ/kg |
1659.8 | Btu/lb | |
Entropy | 53.14 | J/g-K |
12.70 | Btu/lb-°R | |
Flame temperature in air | 2045 | °C |
3713 | °F | |
Flammable range in air | 4.0 - 75.0 | vol% |
Ignition energy in air [c] | 2.0 E-5 | J |
1.9 E-8 | Btu | |
Internal Energy (NTP) | 2648.3 | kJ/kg |
1139.3 | Btu/lb | |
Molecular weight | 2.02 | |
Specific gravity (air = 1) (NTP) | 0.0696 | |
Specific volume (NTP) | 11.94 | m³/kg |
191.26 | ft³/lb | |
Specific heat at constant pressure, Cp (NTP) | 14.29 | J/g-K |
3.415 | Btu/lb-°R | |
Specific heat at constant volume, Cv (NTP) | 10.16 | J/g-K |
2.428 | Btu/lb-°R | |
Thermal conductivity (NTP) | 0.1825 | W/m-K |
0.1054 | Btu/ft-h-°R | |
Viscosity (NTP) | 8.813 E-5 | g/cm-sec |
5.922 E-6 | lb/ft-sec |
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