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The gas constant for air used in compressible flow calculations is

  • A.8.314 J per kg per K
  • B.1005 J per kg per K
  • C.718 J per kg per K
  • D.287 J per kg per K

Answer: D

The specific gas constant for air is the universal constant divided by the molar mass of air, giving 287 J per kg per K. The value 8.314 is the universal constant in molar units, while 1005 and 718 are the specific heats at constant pressure and constant volume, whose difference is the gas constant itself.

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