1lesson 9III. Properties of a Pure SubstanceG.The Ideal-Gas Equation of State1. The ideal-gas equation of state models the PvT behavior of gases at low pressure.uuPVNR T orPvR T==N = number of moles of gas, kmolT = absolute temperature, K= universal gas constant = 8.314 kJ/(kmol K)V = volume, m3v = specific volume, m3/kg; , m3/kmol R = /M = specific gas constant, kJ/(kg K)M = molecular weight of gas, kg/kmolmolar basismass basis (3-10)PVmRT orPvRT==uRuRvlesson 9III. Properties of a Pure Substance2. Notes on use of ideal-gas equation of statea. The temperature, T, must be absolute (Kelvin or Rankine)b. The pressure, p, must be absolutec. The universal gas constant, , is different from the specific gas constant, R. Use the most convenient units.R, kPa•m3/kg•K , kPa•m3/kmol•KSubstanceorkJ/kg•KorkJ/kmol•KAir0.2878.314Helium2.0778.314Hydrogen4.1248.314Carbon dioxide0.1898.314uRuR
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