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The equation of state for a perfect gas is p = δRT, where R is______ (for air at standard conditions).(a) 287 kJ/kg.K(b) 8314 kJ/kg(c) 8.314 kJ/kgK(d) 287 J/kg.KI had been asked this question in exam.I'd like to ask this question from A Brief Review of Thermodynamics in chapter Compressible Flow – Preliminary Aspects of Aerodynamics |
Answer» RIGHT choice is (d) 287 J/kg.K The explanation is: The universal gas CONSTANT R in the equation of gas has different VALUES for different gases and at different conditions. For AIR at standard conditions, the correct value is 287 J/kg.K (check units). |
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