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Apr 13, 2015 at 23:04 comment added Michael Renardy You will find free energy explained in any basic text on thermodynamics
Apr 13, 2015 at 21:18 comment added guacho Thank you for your comment. I already knew about the term "free energy". There is another question arising here: what is the difference between and energy and a free energy?
Apr 13, 2015 at 20:23 comment added Deane Yang Well, given that entropy is supposed to measure how much randomness or noise there is, it is natural to have it increase in time. So the hyperbolic conservation law people somehow got it wrong.
Apr 13, 2015 at 19:14 history answered Michael Renardy CC BY-SA 3.0