The name is absent

derson [76, 77] for atomic fluids to chain-like fluids. It is a second-order perturbation
theory, in which the Helmholtz free energy is given as a sum of first- and second-order
contributions, as

^disp j^disp ^disp

NKT ⁼ NKT ⁺ NKT'

For chain-like molecules, the first and second term of the perturbation expansion have

the following form

/I '^>'>-'t'                                 ________ ________ _zr

Zl₁                    τ ^r' X ʌ                 _z ∖  4

= -2πpl₁ ^^x_ix_jm_im_j(-)σ_ij,

i j

and

NKT

where Z^hc is the compressibility factor of the hard-chain fluid, the parameters eŋ and
σ_ij are obtained by conventional Berthelot-Lorentz mixing rules, m is the average
chain length of the mixture defined as

771 = ^xi^miι
i

and ʃi and I<z are integrals given as

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