By Wikipedia, the free encyclopedia, <a href="http://en.wikipedia.org/wiki/ThermodynamicsIn">http://en.wikipedia.org/wiki/ThermodynamicsIn</a> physics, thermodynamics (from the Greek ????????-<????????????????, therme, meaning heat and ??????????????, dynamis, meaning power) is the study of the conversion of energy into work and heat and its relation to macroscopic variables such as temperature and pressure.