Condensed Matter Physics, 1996, No. 7, p. 101-116, English
The reasons for a necessity of taking into account 3-body interactions in a description of a behaviour of real fluid near the liquid-gas critical point are regarded. The influence of 3-body forces on some properties of argon is estimated. Particularly, a way of taking into account 3-body interactions in the theory of liquid-gas critical point by the collective variables method is considered.The effects of 3-body forces on the structure functions of the reference system,as well as on the value of 3-rd virial coefficient and on the thermodynamical properties of some simple real system are investigated. Using the generalized mean field theory, the critical amplitudes for some thermodynamic functions of argon are calculated.Comments: Refs. 16, Figs. 7, Tabs. 1.
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