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--- 2021:meeting_talk13 [2021/08/22 14:22]
sokolic created
+++ 2021:meeting_talk13 [2021/08/22 14:24] (current)
sokolic
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-====== 	Entropy? Entropy! ======
+====== 	Entropy! Entropy? ======
 **Franjo Sokolić**\\
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 {{:2021:pp_fs_2021_abstract.pdf|}}
+<blockquote>
+Energy and entropy are two most important concepts in physic. Their
+essence is revealed by two principles of thermodynamic. Energy is
+conserved and, entropy is increased during any real physical process. The
+link between them is the notion of heat. There is a lot misunderstanding
+about the physical meaning of heat, because it is very far from its intuitive
+understanding. For instance, the expression “transfer of heat” has no sense
+because heat itself is a mode of transfer of energy, like work, and we do not
+speak about the transfer of work. On the other hand, entropy is contained in
+the body, and it is related to heat by the Clausius relation dS = đQ rev / T,
+saying the change in entropy during a reversible process is equal to the heat
+divided by the absolute temperature. Beside this definition of entropy there
+is also Boltzmann’s, Gibbs’s, Shanon’s, and von Neumann’s quantum
+definition.
+Do they represent the same thing?
+What is the relationship between them?
+Can we apply them straightforwardly to different physical situations?
+</blockquote>