Gibbs-Helmholtz equation
The
Gibbs-Helmholtz equation is a
thermodynamic relationship useful for calculating changes in the
energy or
enthalpy (heat content) of a system. Two useful general forms of this equation are:
Where
A is the
work function,
U is the
internal energy of the system,
T is the
absolute temperature,
V is the
volume,
P is the
pressure,
G is the
Gibbs free energy and
H is the
heat content(
enthalpy) of the system.