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at ntp what os temp of hydrogen


Shreya Desai 18th Oct, 2019
Answer (1)
Ronak Gala Student Expert 19th Oct, 2019
Basic Hydrogen Properties

Data including density, flammability range, and auto ignition energy for hydrogen.

Properties Value Units
Auto ignition temperature [3,a] 500-585 °C
932-1085 °F
Boiling point (1 atm) [b] -252.9 °C
-423.2 °F
Density NTP [1,b] 0.08375 kg/m³
0.005229 lb/ft³
Diffusion coefficient in air NTP [1, a] 0.610 cm²/s
6.57 E-4 ft²/s
Enthalpy NTP [1, b] 3858.1 kJ/kg
1659.8 Btu/lb
Entropy NTP [1, b] 53.14 J/g-K
12.70 Btu/lb-°R
Flame temperature in air [a] 2045 °C
3713 °F
Flammable range in air [1,a] 4.0 - 75.0 vol%
Ignition energy in air [c] 2.0 E-5 J
1.9 E-8 Btu
Internal Energy NTP [1, 2, b] 2648.3 kJ/kg
1139.3 Btu/lb
Molecular weight [b] 2.02
Specific gravity (air = 1) NTP [1, c] 0.0696
Specific volume NTP [1,b] 11.94 m³/kg
191.26 ft³/lb
Specific heat at constant pressure , Cp NTP [1, b] 14.29 J/g-K
3.415 Btu/lb-°R
Specific heat at constant volume, Cv NTP [1, b] 10.16 J/g-K
2.428 Btu/lb-°R
Thermal conductivity NTP [1, b] 0.1825 W/m-K
0.1054 Btu/ft-h-°R
Viscosity NTP [1,b] 8.813 E-5 g/cm-sec
5.922 E-6 lb/ft-sec

Notes:

  1. NTP (normal temperature and pressure) = 20°C (68°F) and 1 atm
  2. Reference state: Internal Energy U=0 at 273.16 K for saturated liquid; Entropy S=0 at 273.16 K for saturated liquid.
  3. The autoignition temperature depends on hydrogen concentration (minimum at stoichiometric combustion conditions), pressure, and even the surface characteristics of the vessel.  Reported figures range from 932-1085 oF according to source [a].

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