On the convergence of Green's entropy expansion

István Borzsák, András Baranyai

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We tested the convergence of Green's entropy expansion for hard sphere systems of different dimensions (D = 1, 2, 3). We compared the two-body and (for D= 1 and 3) the sum of the two-body and three-body entropy contributions to the total excess entropy in these systems. The qualitative properties of the expansion are very similar for the three tested models. The two-body contribution gives a good estimate of the excess entropy at low densities but underestimates the absolute value of the excess entropy at intermediate densities. In this region the inclusion of the three-body entropy contribution improves the accuracy of the expansion. Close to the phase transition density (in D= 2,3) the two-body entropy - due to fortuitous cancellations - is again a good approximation of the excess entropy.

Original languageEnglish
Pages (from-to)227-230
Number of pages4
JournalChemical Physics
Issue number2-3
Publication statusPublished - Sep 15 1992


ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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