Molecular dynamics calculation of two clustering processes for atoms of Lennard-Jones (L-J) potential and water molecules is described. One clustering process is under the adiabatic condition from the gas state by lowering of the temperature. Another is thermal decomposition of liquid droplet. The system consists of 8192 L-J atoms or 512 water molecules. Vibrational, rotational, and translational temperature and potential energy were used to analyze the clustering process. Clear magic number was not observed in any proces
