The heat capacity of a liquid is investigated in the paper. For this, the cell-cluster expansion for the free energy is used, taking into account three-particle clusters, inclusive. A system was chosen as the reference one, the potential of interaction between particles of which is a generalization of the Weeks-Chandler-Andersen potential for the case of effective consideration of not only the influence of nearest neighbors, but also of particles on other coordination spheres. The calculations performed for liquid argon showed good agreement between the theoretical results and experimental data.
05.70.Ce Thermodynamic functions and equations of state
$^1$Department of Quantum Statistics and Field Theory, Faculty of Physics, M.V.Lomonosov Moscow State University
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