The report dealt with the factors that determined whether a substance will be a liquid or gas at a given temperature or pressure. The models adopted involved 55-256 atoms, and included interparticle forces whose values were set using an adjustable parameter. Potential energies were calculated, and the results showed that the model liquid became a model gas when interatomic forces became weaker. Reasoning in a manner similar to that in the first report, the authors argued that they had provided an explanation for phase transitions that occur in real systems.