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It is shown that the isochoric heat capacity of dense gas, fluid and liquiddecreases with increasing temperature at arbitrary values of a density for manypair interaction potentials, including bonded potentials; that a decrease ofthe isochoric heat capacity of the liquid with increasing temperature isrelated to a decrease of the interaction between the particles with increasingtemperature; that a radial distribution function for nonideal dilute gas, whichis independent of density, can describe a temperature dependence of theisochoric heat capacity of liquid argon; that a radial distribution functiondependent on the density and temperature describes a temperature dependence ofthe isochoric heat capacity of liquid and dense fluid; that theCarnahan-Starling equation of state for soft spheres gives a good quantitativedescription of the isochoric heat capacity of argon; that the fluctuations ofthe kinetic energy increases with temperature faster than that of the potentialenergy; and finally, that a liquid state can be considered as a state of densegas. The explicit expressions to define the Frenkel line on the (temperature,density) plane are derived.

Comments On the heat capacity of liquids at high temperatures, S.M. Stishov, Physica A 478 (2017) 205