Bridgeman parameters

W2) Wobl Equation of State. It is the 4th degree in the volume virial equation proposed in 1914 by Wohl and described in Addnl Ref Aj. it was used by Joffe (Ref 2a) far calcn of parameters of some gases in order to compare the results with those obtd by using the eq (5) of Joffe with equation of Beattie-Bridgeman and vanderWaals Joffe gives (Ref 2a, p 541) for Wohl equation ... 

Plot the Leimard-Jones potentials for each of the gases studied. Obtain ft from Eqs. (16)-(18) by numerioal integration and compare the values from this two-parameter potential with those from the van der Waals and Beattie-Bridgeman equations of state. Optional A simple square-well potential model can also be used to eradely represent the interaction of two molecules. In place of Eq. (18), use the square-well potential and parameters of Ref. 6 to ealeulate /t. Contrast with the results from the Lennard-Jones potential and comment on the sensitivity of the calculations to the form of the potential.]... 

Lastly I would like to consider the Beattie-Bridgeman equation and its offspring the Benedict, Webb, and Rubin equation which start with the VDW equation and replace 1/(V — Nb) by (V + Nb)/V2. Several additional parameters are introduced. However, the above replacement is so meaningless at high densities that I cannot bring myself to comment further on this family of empirical equations. 

Like the van der Waals, Equation (3.53) weighs the competing effects of excluded volume and short-range attractive forces using two parameters. The Beatie-Bridgeman equation appeals to three parameters ... 

Other equations of state can be found in the book by Hirschfelder, Curtiss, and Bird, including the Beattie-Bridgeman equation, with five parameters, and the Benedict-Webb-Rubin equation, with eight parameters. 

Gillespie and Beattie [8] computed this parameter for the ammonia synthesis reaction, representing the specific volume of the various gases by the Beattie-Bridgeman EOS. They presented their results in the form... 

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