Physical Chemistry of Earth´s Materials
The Use of Thermodynamics in Geosciences: Explanations, Tools, and Code
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Principles
For geological systems which are usually defined by the variables
P
and
T
, the Gibbs free energy
G
is the function of choice to describe equilibria. At constant
P
and
T
the chemical equilibrium conditions is then defined by:
Thermodynamics of fluids
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Fugacities