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nature : an important thermodynamic functions, it is material characterization system thermal state of a physical nature, S, units of Coke / issuer. Entropy is the size of the state of spontaneous possibility of achieving a measure of greater entropy state, the greater the likelihood of achieving. If nitrogen and two oxygen gas closed in the same containers, nitrogen, oxygen from the possibility of small, and the possibility of mixing, the former small entropy, which the entropy large. Molecular movement point of view, because the thermal motion of molecules, the molecular material from the system in an orderly trend chaos, the entropy change large molecular motion said the increased confusion. Experiences show that isolation system for the process of spontaneous, always made the process of system, so that system always increase the entropy. Entropy tends to be the largest of all the characteristics of the physical and chemical processes can achieve the criteria. With the entropy function, the second law of thermodynamics then able to quantify the expression, thereby quantitatively determine, under the conditions specified in a process can, if carried out, what its ultimate limits. In the chemical and chemical calculation, the regular use "temperature-entropy map" (T-S) and the entropy function derived on the basis of which a number of other convenient application of thermodynamic functions, and they are mostly used in the calculation of the chemical reaction equilibrium constant, the maximum rate of production involved the issue of balance.
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