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characteristic functions
Molecular formula :

nature : When a thermodynamic function with the appropriate choice of a variable group said, a uniform system of all the balanced nature of this one function can be learned. This function is referred to the characteristics of the selected variables function. For example, a uniform composition of the same thermodynamic system, if known to be able to (U) for the volume (V) and entropy (S) function, U = U (V, S), differential from thermodynamic relationship of the other shows a balance in nature : T = V, P = H = U + Vs, F = U-Sv, G = U + Vs - Sv. The thermodynamic properties important function there : H = H (S p), S = S (U, V), F = F (T, V), G = G (T, P).

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