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Chemical and physical properties
Hydrogen is a colorless, odorless, nonmetallic, tasteless, highly flammable diatomic gas with the molecular formula H2.

Properties at STP
(273.15 K (0°C), 101.3 kPa)

Density = 0.0899 kg/m3
Specific heat capacity
              Cp = 28.59 J/(mol K)
              Cv = 20.3 J/(mol K)


Viscosity =  8.34×10–3 mPa s
Velocity of sound =  1246 m/s
Thermal conductivity  = 173.9×10–3 W/(m K)      

Melting point = -259,20 °C

Boiling point = -252,77 °C

Critical point:  -239,97°C and 1,315 MPa
Critical density = 0,03012 g/l

Standard atomic weight  H = 1,00794 g/mol                                           
                                           
H2 = 2,01588 g/mol
Specific heat capacity = 14.304 J/(kg K)
                                           resp. 28.836 J/(mol K) at 25°C

Heat of vaporization = 0,891 kJ/mol

Density = 0,0899 g/l (at 0°C and 101,3 kPa)
Density = 0,06952 g/l (at 25°C and 101,3 kPa)
Density = 0,0708 g/l (at -253 °C and 101,3 kPa)

Inversion temperature = -80°C
(In case a gas is expanded below its inversion temperature it will get colder, in case the gas is expanded above this temperature it will get warmer)
(cf. inversion temperature or air = 450°C)

Solubility in water  (in mg per liter):

0 °C

 

10 °C

 

20 °C

 

30 °C

 

40 °C

 

50 °C

 

60 °C

 

80 °C

 

1,9

 

1,7

 

1,6

 

1,5

 

1,4

 

1,3

 

1,2

 

0,8

 

Density compared to air = 0,07 (air =1)
Explosive limit = 4,1 – 74,8 vol %
Ignition temperature = 560 °C


Triple point
Temperature  = 13.957 K ( -259,2°C)
Pressure = 7.2 kPa

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Tel: +49 711 87030-0
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