Fig. describes the process in an isolated system where condensation spontaneously undergoes in quest of thermal equilibrium with the surroundings. In an isolated system, once two particles undergo the inelastic collision, the new entity must be stabilized by releasing the thermal energy, i.e., the thermal irradiation. Otherwise, the entity will be degraded. Therefore, the formation of a cool droplet is the result of evaporation (sublimation)-condensation process in which 𝑥 < 𝑥 . Here, it should be noted that thermal irradiation is also a kind of heat, which is not included in Eq. 4 and Eq. 5. Hence, the inclusion of thermal irradiation is the future work. Once a droplet forms, the volumetric superiority renders the droplet incorporate more particles than the smaller ones. In addition, the combined effects such as the effect of inverse process, i.e., evaporation, the distance-dependent warming effects of thermal irradiation preferably to particles near the droplet surface, and the high probability of collision of high-temperature particles will make the gas phase form a gradient of VG and T (Fig. ), which distanced from a droplet, ( ) < 0 , but ( ) > 0. On the other hand, given that the space of the system is large enough and the number of molecules as well, many droplets may form and be randomly distributed. Hence, the fate of gas molecules, including droplets, will be: