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Full-Text Articles in Physical Sciences and Mathematics

Fugacity Examples 2: The Fugacity Of A “Hard-Sphere” Semi-Ideal Gas And The Van Der Waals Gas, Carl W. David Aug 2015

Fugacity Examples 2: The Fugacity Of A “Hard-Sphere” Semi-Ideal Gas And The Van Der Waals Gas, Carl W. David

Chemistry Education Materials

The fugacity of the van der Waals gas is obtained after a review of the concept itself.


Errata For Tensor Of Moment Of Inertia (52) Manuscript, Carl W. David Aug 2015

Errata For Tensor Of Moment Of Inertia (52) Manuscript, Carl W. David

Chemistry Education Materials

An error in the manuscript (52) of this series is noted


Plotting The Van Der Waals Fluid In Pseudo-3d And The Maxwell Construction, Carl W. David Jul 2015

Plotting The Van Der Waals Fluid In Pseudo-3d And The Maxwell Construction, Carl W. David

Chemistry Education Materials

The van der Waals (from his thesis of 1873) equation is a cubic in the molar volume. Plotting the equation in pseudo 3 dimensions is quite simple to do, but including tie lines is quite difficult. Employing the solutions to the cubic van der Waals equation, the tie lines are readily available and can be easily incorporated into the aforementioned 3D plots.


The Van Der Waals Equation As A Cubic, Carl W. David Jan 2015

The Van Der Waals Equation As A Cubic, Carl W. David

Chemistry Education Materials

The van der Waals (from his thesis of 1873) equation is a cubic in the molar volume. Since this is the first equation of state studied in chemistry more complicated than the ideal gas equation, it is noteworthy that the solution of this cubic is rarely if ever addressed. When (lowering the temperature) the two imaginary roots coalesce with the real root of the van der Waals equation we have the critical point. At Kelvin temperatures below Tc. the equation has three real roots; we explore obtaining those roots to aid in the Maxwell construction required to obtain the vapor …