Using Expanded Wang-Landau simulations, we calculate the ideality contours for 3 molecular fluids (SF 6 , CO 2 and H 2 O). We analyze how the increase in polarity, and thus, in the strength of the intermolecular interactions, impacts the contours and thermodynamic regularities. This effect results the increase in the Boyle and H parameters, that underlie the Zeno line and the curve of ideal enthalpy. Furthermore, a detailed analysis reveals that dipole-dipole interactions lead to much larger enthalpic contributions to the Gibbs free energy. This accounts for the much higher temperatures and pressures that are necessary for supercritical H 2 O to achieve ideal-like thermodynamic properties.
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