A New equation of state

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The new equation of state is a free energy function that can yield all the thermodynamic values of seawater of known temperature, salinity and pressure. This is more convenient than EOS for modelers who examine the theoretical properties of seawater.

1. Introduction

Rainer Reistel, from the Leibniz Institute for Baltic Sea Research in Germany, is widely recognized as the pioneer in developing the new free energy function. Since then this group has arrived at a series of algorithms that incorporate oceanography's best knowledge of seawater thermodynamics. The approach taken by WG has been to develop a Gibbs function from which all the thermodynamic properties of seawater can be derived by purely mathematical manipulations.

This method ensures that the various thermodynamic properties are self-consistent and complete. Named for physical chemist G. Gibbs, who developed free energy equations that can be used to study the thermodynamic properties of fluids. The new equation of state is based on a Gibbs function for seawater from which all the thermophysical properties of seawater can be derived in a physically consistent manner. The reason for preferring Absolute Salinity over Practical Salinity is because the thermodynamic properties of seawater are directly influenced by the mass of dissolved constituents, or Absolute Salinity, whereas Practical Salinity depends of conductivity," said Millero.

While Practical Salinity will still be the salinity variable that is stored in national databases much as in situ temperature is stored in these databases , it is the new Absolute Salinity that will be used in journal publications, numerical ocean models and inverse models as temperature is not used now, but rather, potential temperature for these purposes.

The main reason for adopting the new salinity variable is to allow for the spatial differences in seawater composition; this variable composition affects conductivity differently to how it affects factors such as density, enthalpy, entropy and more.

Note: Content may be edited for style and length. Science News. ScienceDaily, 5 February Retrieved September 24, from www. China E-mail: jianghua lyu. In this paper, we derived a new equation of state for hard polyhedron fluids that is obtained by the knowledge of virial coefficients and a fit to the computer simulation data for the compressibility factor, and which contains two adjustable parameters.

This equation reproduces exactly the correct known virial coefficients up to the ninth one and also the compressibility factor data with high accuracy, the absolute average deviations AADs being 0. For 12 of the other hard polyhedron fluids, it reproduces exactly the correct known virial coefficients up to the eighth one and also the compressibility factor data in the stable state with AADs less than 0.


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