ABSTRACT
Although structures of molecular configurations change at every moment due to thermal vibration, liquids can be regarded as random packing of particles. The radial distribution function, i.e., the probability of finding a particle at a distance from a central sphere, and the distribution of the local particle concentrations are useful for expressing the structure of the random particle assemblage. Since each particle is in contact with others overall, the particle spacing no longer makes sense. The radial distribution function is the most suitable expression for the average internal structure of the packing, and various theoretical approaches to obtain this function have been devised in statistical thermodynamics, but no procedure is expected to apply for the high concentration region such as the random packing. What is mentioned so far are the results obtained from the random assemblage of the equal spheres.
