accentric factor describes asymmetry of molecules EOS tuning purposes. General assumption for cubic EOS is that molecules cannot be infinitely compressed, and that they interact on sub-molecular scale. Tacitly, molecules were approximated as spheres. However, more complex molecules can cause errors in EOS calculation with these assumptions, which are most apparent at phase equilibria predictions. However, accf for pseudo components is tuned as statistical parameter, i.e. almost by random, neglecting physical meaning.
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