AbstractThe Generalized van der Waals model has been examined and discussed using high‐pressure experimental data previously reported for tetramethylsilane over a wide range of temperature. The study has been focused on the temperature dependence of the two following characteristic quantities: the effective volume of the hard convex body ν*, which represents the molecules of the fluid, and the attractive van der Waals parameter (a/ν*). It has been confirmed that the nearly universal relation found between the medium densities correction to the compressibility factor (in the formulation of Móritz and Kohler) and the limiting value of the attractive parameter at high densities (a0/ν*) holds for tetramethylsilane. In addition, it has been studied the general form of the low density correction, which can be directly related to third virial coeffi