Gibbs 1873-1878: G = H - TS; spontaneous if dG < 0 at constant T,P; equilibrium dG = 0; chemical-potential mu_i = (dG/dn_i)_{T,P,n_j}; basis of phase + reaction equilibria.
Gibbs 1873-1878: G = H - TS; spontaneous if dG < 0 at constant T,P; equilibrium dG = 0; chemical-potential mu_i = (dG/dn_i)_{T,P,n_j}; basis of phase + reaction equilibria.