"Negative Temperature", a Necessary and Sufficient Condition for Entropy Decrease in an Isolated System: Difference between revisions
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{{Infobox paper | {{Infobox paper | ||
| title = | | title = "Negative Temperature", a Necessary and Sufficient Condition for Entropy Decrease in an Isolated System | ||
| url = [http://www.naturalphilosophy.org/pdf/abstracts/abstracts_5960.pdf Link to paper] | | url = [http://www.naturalphilosophy.org/pdf/abstracts/abstracts_5960.pdf Link to paper] | ||
| author = [[Yi-Fang Chang]] | | author = [[Yi-Fang Chang]] | ||
| keywords = Temperature, entropy | |||
| published = 2011 | | published = 2011 | ||
| journal = [[Proceedings of the NPA]] | | journal = [[Proceedings of the NPA]] | ||
| volume = | | volume = 8 | ||
| num_pages = 5 | | num_pages = 5 | ||
| pages = 116-121 | | pages = 116-121 | ||
| Line 14: | Line 15: | ||
==Abstract== | ==Abstract== | ||
Negative temperature is based on the Kelvin scale and the condition ''dU''>0 and ''dS''<0. Conversely, there is also negative temperature for ''dU''<0 and ''dS''>0. When the derivation of negative temperature is examined, it necessarily requires a decrease in entropy. The concept of negative temperature contradicts the usual meaning of "temperature", as well as contradicting some basic concepts of physics and mathematics. Negative temperatures can be shown to occur only in a system which is not in thermodynamic equilibrium. It is here proposed that the decrease of entropy is possible due to magnified fluctuations and internal interactions in some isolated systems. Further, a necessary and sufficient condition for the decrease of entropy is discussed quantitatively. In addition, some possible tests for the decrease of entropy in isolated systems are proposed. They should be confirmed by many stable states in nature.[[Category:Scientific Paper]] | Negative temperature is based on the Kelvin scale and the condition ''dU''>0 and ''dS''<0. Conversely, there is also negative temperature for ''dU''<0 and ''dS''>0. When the derivation of negative temperature is examined, it necessarily requires a decrease in entropy. The concept of negative temperature contradicts the usual meaning of "temperature", as well as contradicting some basic concepts of physics and mathematics. Negative temperatures can be shown to occur only in a system which is not in thermodynamic equilibrium. It is here proposed that the decrease of entropy is possible due to magnified fluctuations and internal interactions in some isolated systems. Further, a necessary and sufficient condition for the decrease of entropy is discussed quantitatively. In addition, some possible tests for the decrease of entropy in isolated systems are proposed. They should be confirmed by many stable states in nature. | ||
[[Category:Scientific Paper|negative temperature necessary sufficient condition entropy decrease isolated]] | |||
Latest revision as of 09:36, 21 July 2026
| Scientific Paper | |
|---|---|
| Title | "Negative Temperature", a Necessary and Sufficient Condition for Entropy Decrease in an Isolated System |
| Read in full | Link to paper |
| Author(s) | Yi-Fang Chang |
| Keywords | Temperature, entropy |
| Published | 2011 |
| Journal | Proceedings of the NPA |
| Volume | 8 |
| No. of pages | 5 |
| Pages | 116-121 |
Read the full paper here
Abstract
Negative temperature is based on the Kelvin scale and the condition dU>0 and dS<0. Conversely, there is also negative temperature for dU<0 and dS>0. When the derivation of negative temperature is examined, it necessarily requires a decrease in entropy. The concept of negative temperature contradicts the usual meaning of "temperature", as well as contradicting some basic concepts of physics and mathematics. Negative temperatures can be shown to occur only in a system which is not in thermodynamic equilibrium. It is here proposed that the decrease of entropy is possible due to magnified fluctuations and internal interactions in some isolated systems. Further, a necessary and sufficient condition for the decrease of entropy is discussed quantitatively. In addition, some possible tests for the decrease of entropy in isolated systems are proposed. They should be confirmed by many stable states in nature.