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Takahasi Nearest-Neighbour Gas Revisited; Stockmayer Gases with a Hard Core

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Takahasi Nearest-Neighbour Gas Revisited; Stockmayer Gases with a Hard Core

Akira Matsumoto

Department of Molecular Sciences, Faculty of Science, Osaka Prefecture University, Gakuencho 1 – 1, Nakaku, Sakai, Osaka, 599-8531, Japan

Reprint requests to A. M.; E-mail: akibohn@nifty.com

Z. Naturforsch.66a,247 – 250 (2011); received March 22, 2010 / revised June 16, 2010

Some thermodynamic quantities for the Stockmayer potential (12, 6, 3) with a hard core are analyt- ically evaluated at an isobaric process. The parameters of polar gases for 16 substances are obtained.

Also some thermodynamic quantities for H2O are calculated numerically and drawn graphically. The inflexion point of the lengthLcorresponds physically to a boiling point.Lindicates the liquid phase from lower temperature to the inflexion point and the gaseous phase from the inflexion point to higher temperature. The boiling temperatures indicate reasonable values compared with experimental data.

The behaviour ofLsuggests the chance of a first-order phase transition in one-dimension.

Key words:Takahasi Nearest-Neighbour Gas; Stockmayer Potential; Boiling Temperature;

Equation of State; Enthalpy; First-Order Phase Transition.

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