| Issue |
EPL
Volume 153, Number 3, February 2026
|
|
|---|---|---|
| Article Number | 31003 | |
| Number of page(s) | 7 | |
| Section | Statistical physics and networks | |
| DOI | https://doi.org/10.1209/0295-5075/ae4060 | |
| Published online | 16 February 2026 | |
Thermodynamic geometry of two-dimensional square-well fluids
1 División de Ciencias e Ingenierías, Campus León, Universidad de Guanajuato - León, Guanajuato, México
2 Departamento de Física Aplicada, Universidade de Vigo - Vigo, Pontevedra, España
Received: 13 October 2025
Accepted: 2 February 2026
Abstract
Thermodynamic geometry of two-dimensional fluids has been investigated using a square-well model as a prototype fluid. A comparison with the three-dimensional case is performed in the subcritical and supercritical domains of thermodynamic space. In the subcritical region, it is found that the R-crossing method has a narrower range of validity for two-dimensional fluids compared to three-dimensional ones. On the other hand, in the supercritical region, an analysis of different Widom lines, including the R Widom line, shows that for two-dimensional fluids these lines extend further into the supercritical region than their three-dimensional counterparts. A similar behavior is observed for the validity of the Clausius-Clapeyron equation in two-dimensional fluids.
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