Timeline for Existence of negative temperatures and the definition of entropy
Current License: CC BY-SA 3.0
5 events
| when toggle format | what | by | license | comment | |
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| Jul 11, 2014 at 23:58 | comment | added | Semola | Nanite, why do you say a spin inversion experiment cannot be described by a micro canonical nor canonical ensemble?? | |
| Jul 11, 2014 at 23:56 | comment | added | Semola | amlrg-ok for a classical system, but Equipartition theorem does not always hold for quantum systems (when kT is smaller than $\Delta E$). | |
| Jul 10, 2014 at 4:54 | comment | added | alarge | Take a classical N-atom system in the microcanonical ensemble. Should we not be able to always define the temperature through the equipartition theorem or using the Maxwell-Boltzmann velocity distribution? Do the definitions of entropy agree here, and is it only in some stranger systems that they might not? @JánLalinský in his answer discussed strange systems, but it is somewhat unclear to me if his comments apply more generally, or if one should only beware of these strange systems: i.e. if the two definitions can disagree even in systems with strictly positive temperatures or not. | |
| Jul 9, 2014 at 23:59 | comment | added | Ján Lalinský | "But neither surface nor volume "temperature" have this property!" I know that the volume temperature does not have this property. But what is the problem with surface temperature? The rule of maximum probability (energy is most likely distributed in such a way that the multiplicity of the supersystem is the greatest possible) leads to equality of "surface" temperatures. | |
| Jul 9, 2014 at 21:33 | history | answered | Nanite | CC BY-SA 3.0 |