Many wiki articles contained horrible mistakes for many years until just a few days ago when I started to edit them. http://en.wikipedia.org/w/index.php?title=Helmholtz_free_energy&oldid=212028025" This had been the wiki article since many years. :yuck: http://en.wikipedia.org/wiki/Helmholtz_free_energy" [Broken] http://en.wikipedia.org/w/index.php?title=Fundamental_thermodynamic_relation&oldid=206545149" Utterly flawed statements in that article. Also the correct name is "Fundamental thermodynamic relation" not "combined law of thermodynamics" (the title now shows the corect name because it was later moved by me). :yuck: Then Count Iblis come along and http://en.wikipedia.org/wiki/Fundamental_thermodynamic_relation" [Broken] http://scienceworld.wolfram.com/physics/CombinedLawofThermodynamics.html" [Broken] http://scienceworld.wolfram.com/physics/HelmholtzFreeEnergy.html" [Broken] Some other articles were also corrected by me. So, we can now say that wikipedia has become one of the most reliable sources on thermal and statistical physics on the intnernet. Not least because they were so bad until recently and many other websites had copied them.