The Line of the Unit Compressibility Factor in the Low-Temperature Plasma of Metals

The behavior of the line of the unit compressibility factor in the region of low-temperature dense plasma of metals is studied for the first time. The shape of this line is universal in the density–temperature plane for many one-component gases and liquids at low temperatures, along with liquid metals. Using virial expansions and calculations within the framework of the chemical model, we demonstrate that such a similarity breaks apart upon transition to the region of low-temperature plasma of metals. Nevertheless, a weaker similarity expressed in the form of a power law is possible for the discussed line in this region at relatively low densities.