at ntp what os temp of hydrogen

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at ntp what os temp of hydrogen

Shreya Desai 18th Oct, 2019

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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:

NTP (normal temperature and pressure) = 20°C (68°F) and 1 atm
Reference state: Internal Energy U=0 at 273.16 K for saturated liquid; Entropy S=0 at 273.16 K for saturated liquid.
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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