The investigations concerning the behaviour of the fluid near the critical point still remain actual. In the previous papers, by using the collective variables (CV) method, we have obtained the grand partition function in the form, suitable for investigation in the vicinity of the critical point.The aim of the present paper is to describe the system both above and below, to analyse a behaviour of the chemical potential below and to obtain a horisontal plateau on the plot for corresponding to the liquid-gas phase transition.
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