Free energy and free Enthalpy

Free energy -: Free energy ( or Helmholtz function) is defined as  f = u - Ts .
It is equal to the work during a constant- volume isothermal reversible nonflow process .

Free Enthalpy -: Free enthalpy ( or Gibbs function ) is defined as  g = h - Ts
Where , u = internal energy  h = enthalpy ,      T = temperature, s = entropy 

Gibbs function is of particular importance in processes where chemical changes occur. For reversible isothermal steady flow pro-cesses or for reversible constant- pressure isothermal nonflow processes , change in free energy is equal to net work .

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I.C ENGINE MCQ

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