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UN EQUILIBRE THERMODYNAMIQUERappels de thermodynamiqueG = U + PV - TS = H - TSOù U : Energie du systèmeH : Enthalpie H = U + PVP : PressionT : TempératureS : entropie : définit l ’ordre-désordre du cristalT ∆S o = δ Q apport d ’énergie thermique au minéral∆G = ∆H - T ∆S + P ∆V + RT Ln K = 0

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