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For a single component system, vapor (subscript $g$) and liquid (subscript $f$) coexist in mechanical, thermal and phase equilibrium when

  1. $u_{g}=u_{f}$ (equality of specific internal energy)
  2. $h_{g}=h_{f}$ (equality of specific enthalpy)
  3. $s_{g}=s_{f}$ (equality of specific entropy)
  4. $g_{g}=g_{f}$ (equality of specific Gibbs free energy)
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