Journal
PHYSICS LETTERS A
Volume 379, Issue 7, Pages 646-649Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physleta.2014.12.021
Keywords
Metric geometry of thermodynamics; Fluid equations of state; Water; Thermodynamic curvature; Phase transitions and critical points; Widom line
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We evaluate the thermodynamic curvature R for fluid argon, hydrogen, carbon dioxide, and water. For these fluids, R is mostly negative, but we also find significant regimes of positive R, which we interpret as indicating solid-like fluid properties. Regimes of positive R are present in all four fluids at very high pressure. Water has, in addition, a narrow slab of positive R in the stable liquid phase near its triple point Also, water is the only fluid we found having R decrease on cooling into the metastable liquid phase, consistent with a possible second critical point. (C) 2014 Elsevier B.V. All rights reserved.
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