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- W2578176545 abstract "Negative absolute temperatures were introduced into experimental physics by Purcell and Pound, who successfully applied this concept to nuclear spins; nevertheless, the concept has proved controversial: a recent article aroused considerable interest by its claim, based on a classical entropy formula (the volume entropy) due to Gibbs, that negative temperatures violated basic principles of statistical thermodynamics. Here we give a thermodynamic analysis that confirms the negative-temperature interpretation of the Purcell-Pound experiments. We also examine the principal arguments that have been advanced against the negative temperature concept; we find that these arguments are not logically compelling, and moreover that the underlying volume entropy formula leads to predictions inconsistent with existing experimental results on nuclear spins. We conclude that, despite the counterarguments, negative absolute temperatures make good theoretical sense and did occur in the experiments designed to produce them." @default.
- W2578176545 created "2017-01-26" @default.
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- W2578176545 date "2017-01-17" @default.
- W2578176545 modified "2023-10-16" @default.
- W2578176545 title "Physics of negative absolute temperatures" @default.
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- W2578176545 doi "https://doi.org/10.1103/physreve.95.012125" @default.
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