Abstract
To characterize the behavior of the thermodynamic properties of systems near a critical point, systems are grouped into universality classes. Systems within a universality class have the same universal critical exponents and scaling functions. Specifically, fluids are expected to belong to the universality class of three-dimensional Ising-like systems for which the universal quantities have been calculated with considerable accuracy. A scaled fundamental equation is presented which incorporates these theoretical predictions. Results obtained for various technologically important fluids, namely ordinary steam, heavy steam, ethylene, and isobutane, are discussed.
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Sengers, J.V., Levelt Sengers, J.M.H. A universal representation of the thermodynamic properties of fluids in the critical region. Int J Thermophys 5, 195–208 (1984). https://doi.org/10.1007/BF00505500
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DOI: https://doi.org/10.1007/BF00505500