Timeline for If entropy measures energy spread, what it is spread over?
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| Dec 31, 2018 at 9:08 | comment | added | RodolfoAP | @coobit, a molecule is made by matter, which ultimately has an equivalence to energy (independently of the fact that that it is technically difficult to convert matter to energy). But in thermodynamics, matter has no equivalence to energy. Only the kinetic energy of molecules is considered, not the potential energy (e.g. energy types like the Morse potential or the equivalence mass -- energy of the atoms in the molecule). | |
| Dec 30, 2018 at 13:45 | comment | added | coobit | In the whole, as the sum of the energy of the parts. The total energy of the parts (internal to each part, internal to each molecule) is not considered Hm.. Do you say that "whole energy = energy of parts" and then say the opposite ( =The total energy of the parts is not considered = there is no energy of the parts"? Sorry, I can't understand. | |
| Dec 29, 2018 at 9:59 | comment | added | RodolfoAP | @Alexander: Entropy not 0 at 0K: correct. The 3rd law allows the calculation of the absolute value of entropy, which is complex to do when energy flows between sub-systems. At $0K$, energy stops flowing, so it is the point that we can use to define a conventional magnitude (whatever value is ok, as long as it supports further calculation). The definition of temperature was improved (temperature is a transitive relation), whilst temperature is originally a feeling (a perception), of course, subject to debate. Removed "other physicists". Thanks. | |
| Dec 29, 2018 at 9:56 | history | edited | RodolfoAP | CC BY-SA 4.0 |
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| Dec 29, 2018 at 9:53 | comment | added | Alexander | Your interpretation of zero law is also kind of a tongue-twist. The zero'th law states equivalence of equilibrium systems. Then you invent some parameter to quantify it and call it temperature. The equivalence is not under debate, but the definition of temperature is. See this article. When referring to obscure physics opinions ("Arieh Ben-Naim and other physicists"), please refer also to the consensus, in order not to distort the opinions of people new to the field. | |
| Dec 29, 2018 at 9:40 | comment | added | Alexander | The entropy of system doesn't, in general, go to zero as temperature go to zero. See Nernst's theorem | |
| Dec 29, 2018 at 9:09 | history | edited | RodolfoAP | CC BY-SA 4.0 |
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| Dec 29, 2018 at 5:27 | history | edited | RodolfoAP | CC BY-SA 4.0 |
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| Dec 29, 2018 at 5:21 | history | edited | RodolfoAP | CC BY-SA 4.0 |
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| Dec 29, 2018 at 5:11 | history | edited | RodolfoAP | CC BY-SA 4.0 |
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| Dec 29, 2018 at 5:03 | history | answered | RodolfoAP | CC BY-SA 4.0 |