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Gibbs Free energy or Gibbs Energy is the maximum energy available in the form of useful work  that the system can do.  This is in a closed system, ie., volume change is 0.

       G (p, T )    =  U  + p V  - T S
               U = Internal Energy
                p  = Pressure
               V = volume 
               T = temperature
               S = Entropy of the system

We knw that gibbs free engery G(H T)=H-TS where H=anthelpy T=temp S=entropy of systm