** Next:** Chemical Reaction Equilibria
** Up:** Continuum Thermodynamics
** Previous:** Minimum Principles

The Gibbs free energy is partitioned into a potential for each chemical species
,
and
the number of moles of
,
. Then, the Gibbs free energy,
must
be a minimum. Knowing that it is a minimum means its derivative is zero--and this gives us
a bunch of useful equations that apply to states of equilibrium. The fact that it is a minimum
also means that its second derivative is positive definite--this implies restrictions on the
properties of stable materials (such as the bulk modulus and the heat capacity must be positive).

W. Craig Carter
2002-09-05