References: http://johncarlosbaez.wordpress.com/2012/01/23/classical-mechanics-versus-thermodynamics-part-2/ http://en.wikipedia.org/wiki/Thermodynamic_potential http://en.wikipedia.org/wiki/Maxwell_relations http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/thepot.html [*7.80] <>