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p_{pc} = 756.8 -131.07 \, \gamma_g - 74 \, \gamma_g^2


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T_{pc} = 169.2 +349.5 \, \gamma_g - 3.6 \, \gamma_g^2


Sutton, 1985

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body0.57< \gamma_g <1.68

  • High molecular weight gases
  • rich in heptanes
  • minor amount of carbon dioxide and nitrogen
  • no hydrogen sulfide


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p_{pc} = 709.604 - 58.718 \, \gamma_g


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T_{pc} = 170.491 +307.344 \, \gamma_g


Guo and Ghalambor (2005)

H2S < 3%

N2 < 5%

Total content of inorganic compounds < 7%



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p_{pc} = 706 - 51.7 \, \gamma_g - 11.1 \, \gamma_g^2


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T_{pc} = 187 +330 \, \gamma_g - 71.5 \, \gamma_g^2


Standing, 1981Total inorganic compounds  = 0%

Low molecular weight California natural gases









See also

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Natural Science / Physics / Thermodynamics / Thermodynamic system / Pseudo-Critical Point (Tpc, ppc)

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