Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phase transition in a cell fluid model   We propose a method of describing a phase transition in a cell fluid model
with pair interaction potential that includes repulsive and attractive parts.
An exact representation of the grand partition function of this model is
obtained in the collective variables set. The behavior of the system at
temperatures below and above the critical one is explored in the approximation
of a mean-field type. An explicit analytic form of the equation of state which
is applicable in a wide range of temperatures is derived, taking into account
an equation between chemical potential and density. The coexistence curve, the
surface of the equation of state and the phase diagram of the cell Morse fluid
are plotted.

25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
16
The categories of this paper are: stat