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ideal gas law (Specific Heats – Relation With Internal Energy and Enthalpy…

- - - - pv = RT
  - - - T = absolute temperature in K
        
        R = gas constant (kJ/kgK)
        
        R
        o= 8.314 kJ/(kmol K)
- - - - CpdT = cvdT + RdT
        
        Cp = Cv + R
- - - - Constant temperature
        
        The Polytropic Process
        
        The Adiabatic Process
        
        In adiabaticprocessthe working substance do not receiveor gives outheat to its surroundings, (expansion and compression)
        
        forvapour–use table to find the change in internal energy
        
        for a gas, u=f(T), therefore ΔU=0. Then
        
        then the equation of state provides the pressure-volume relation
        
        P = mRT/ V
        
        Q = W
        
        Q - W = AU
      - For vapour, Q –W = ΔU becomes Q = ΔH since it involves change in internal energy and boundary work together