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Every now and then here there are questions about efficiency.http://www.the-scientist.com/?articles.view/articleNo/8514/title/What-Entropy-Is--and-Is-Not/
explains why we should take care when invoking thermodynamics.This elegant quantity is a precisely defined construct of physics; it can be rigorously measured for equilibrium systems and can be given meaning for near-to-equilibrium considerations.
The second law, when formulated in terms of entropy, gives powerful insights into a wide variety of problems. It seems a shame to take such a beautiful and exact idea and blur its meaning by indiscriminately applying it to all sorts of areas that have nothing to do with equilibrium thermodynamics.