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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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