Hey, I know that one....
G is Gibbs Free energy
TS is Temperature X Entropy
Hmm, that would make H enthalpy, not Helmholtz Free energy(sometimes F).
Quick reference here...
http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/thepot.html#c1
Miao Bo, would you like to show us your derivations?
