Editing Twu-Sim-Tassone equation of state

Twu, Sim and Tassone presented a cubic equation of state for accurate representation of hydrocarbon that has become known as the '''Twu-Sim-Tassone''' or '''TST equation of state'''<ref>Twu, C.H., et al, "A Versatile Liquid Activity Model for SRK, PR and A New Cubic Equation of State TST." ''Fluid Phase Equilibria'', 194-197, pp. 385-399, (2002)</ref>.  With a critical compressibility factor <math>Z_c</math> of 0.2962, it better represents many the compressibility of than the Redlich-Kwong, including the Soave modified version, and the Peng-Robinson equation of state and has been shown to better represent long chain hydrocarbons<ref>Twu, C.H., Sim, W.D., Tassone, V. "Getting a Handle on Advanced Cubic Equation of State." ''Measurement & Control'', pp. 58-65, (2002).</ref>.

The equation follows the general cubic form resulting in the equation:

:<math>p=\frac{RT}{V_m-b}-\frac{a}{(V_m-0.5b)(V_m+3b)}</math>

Where <math>V_m</math> is the molar volume, and <math>a</math> and <math>b</math> are the attractive and repulsive parameters akin to those of the [http://www.sklogwiki.org/SklogWiki/index.php/Van_der_Waals_equation_of_state van Der Waals equation of state].

==References==
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