A Dynamic Hard Sphere Model

Abstract

A simple two‐dimensional model, in which uniform hard spheres are made to move steadily and apparently nearly at random, is described. At low sphere density the model exhibits ``gas‐like'' behavior. As the density is increased the behavior becomes more ``liquid‐like'' and then ``crystallization'' occurs. Many dynamic atomic phenomena, believed to occur in the gas, liquid, or solid state, are illustrated by the model.