The discovery of critical points and the exhaustion of diagrammatic representation in thermodynamics
the contributions of James Thomson and the search for a new representation
Keywords:
Thermodynamics of cycles, Critical Points, Diagrammatic representation, Geometric representation, Heuristics of RepresentationAbstract
In this article, we explore the role of critical point discovery in the development of thermodynamics. We argue that this discovery prompted a shift from the formalism of cycles to that of potentials. Thomas Andrews presents a robust empirical basis for the phenomenon of critical points. Building on Andrews' findings, James Thomson laid the groundwork for this transformation by proposing a representation of physical states through a surface in a defined configuration space. In doing so, he leveraged the heuristic potential of diagrams. Notably, Thomson did not develop an operational concept of critical points that could serve theoretical purposes. This gap was bridged by Van der Waals, whose equation of state introduced an operational notion of critical points. Finally, we contextualize Gibbs' contributions within the framework established by James Thomson and Van der Waals, aiming to provide a broad perspective rather than a detailed explanation.
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