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Basic Thermodynamics 2.2

Basic Thermodynamics 2.2 - Summary on Entropy Entropy is a...

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MSE 3050, Phase Diagrams and Kinetics, Leonid Zhigilei Summary on Entropy ¾ Entropy is a state function. ¾ When the weight-heat reservoir system, discussed above, undergoes a spontaneous process which causes the adsorption of heat q at a constant temperature T, the entropy produced by the system Δ S = q/T. The increase in entropy, caused by the process, is thus a measure of the degree of irreversibility. ¾ The increase in entropy due to the occurrence of an irreversible process arises from the degradation of energy potentially available for useful work into heat. ¾ In a reversible process (the driving force is infinitesimal and the process proceeds at an infinitesimal rate) the system moves through a continuum of equilibrium states and the entropy is not created, can only be transferred from one part of the system to another. For more on entropy in reversible processes see Gaskell, §3.4 – 3.9. ¾ The entropy of an adiabatic system cannot decrease. It increases in an irreversible process and remains constant during a reversible process.
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MSE 3050, Phase Diagrams and Kinetics, Leonid Zhigilei The Second Law Again We can reformulate the second law in the following way: For every thermodynamic system
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