[Title: FREE ENERGY] [Intro] G, H minus T S A, U minus T S --- [Verse] Change the variables, change the frame Pick the potential, not the same Hold T and P, or T and V Choose what fits the system you see --- [Chorus] G equals H minus T S At constant T and P, that’s best Delta G less than zero, it goes Maximum work, that’s what it shows --- [Verse] Hold T, hold V, fix the space Helmholtz A defines the case U minus T S sets the way Work available under that constraint --- [Chorus] A equals U minus T S At constant T and V, that’s best Maximum work is what you see Energy free to do the job --- [Bridge] Minus T S, always there Entropy reduces the share Not all energy can be used Only part can do the work --- [Final Chorus] G equals H minus T S A equals U minus T S Pick the conditions, know the case Free energy sets the pace