Gibbs Function
The Gibbs function
is also known as the Gibbs free energy and is defined in terms of temperature,
T, the enthalpy, H, and entropy, S, such that :
G = H - TS.
In a thermodynamic
process with no composition change, the change in Gibbs function is given
by: dG = dH - TdS
- SdT.
Using the combined first and second laws, dU = TdS - PdV
and dH = TdS + VdP gives:
dG = VdP -SdT
For a constant pressure process:
(dG/dT)p = - S, and for a constant temperature process:
(dG/dP)T = V, where V is the volume of the system.
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