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  Berndt Wischnewski  Richard-Wagner-Str. 49  10585 Berlin 
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Some scientific and engineering data online

german

Calculation of thermodynamic state variables of air

lower limit for calculation: -150 C, 1 bar      upper limit: 1000 C, 1000 bar

Pressure:
Temperature:

The following thermodynamic properties will be calculated:
density, dynamic viscosity, kinematic viscosity, specific enthalpy, specific entropy, specific isobar heat capacity cp, thermic conductivity, coefficient of thermal expansion, heat conductance, thermal diffusivity, Prandtl-number, coefficient of compressibility Z.


Calculation of Air : if you found an error, please mail to: wischnewski@mpib-berlin.mpg.de. No garanty for correctness.


Thermodynamic constants of air:
nitrogen 78 %, und oxigen 21 %, argon 0.9 %, carbon dioxide 0.04 %

molar mass
28.96 [ kg / kmol ]
gasconstant R
287.22 [ J / (kg K) ]
isentropic exponent
1.402
critical state variables:
pcrit
37.66 [ bar ]
Tcrit
132.52 or -140.63 [ K or C]
densitycrit
313 [ kg / m3 ]
tripelpoint temperature
60 or -213.15 [ K or C]

 

Air at normconditions, tnorm= 0oC,    pnorm= 1013,25 mbar:

density
1.292 [ kg / m3 ]
isobar heat capacity cp
1.005 [ kJ / (kg K) ]
isochor heat capacity cv
0.718 [ kJ / (kg K) ]
speed of sound
331.5 [ m / s ]

 



Wikipedia ->Air