Key points are not available for this paper at this time.
The “netted ring approximation” is proposed. Several thermodynamic properties are derived by means of this approximation. The radial distribution function is also derived, the expression of which is similar to one based on the netted chain approximation of Rushbrooke and Scoins. The possibility of a phase change in the gas of hard spheres is pointed out.
Kazuo Hiroike (Mon,) studied this question.