The virial expansion is typically applied to low-density systems. When the density is high, where a is a typical molecular or atomic length scale, the virial expansion is impractical. There are to m...The virial expansion is typically applied to low-density systems. When the density is high, where a is a typical molecular or atomic length scale, the virial expansion is impractical. There are to many terms to compute, and to make progress one must use sophisticated resummation techniques to investigate the high density regime. To elucidate the physics of liquids, it is useful to consider the properties of various correlation functions.
