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Technologies concerning complex transfers of heat, mass and movement quantity are developed in many areas such as the environment and the security. In these technologies, we use a large approach of fluid mechanics. Our approach targets the flows around an obstacle, and in a reactive porous medium. Many industrial processes use the fluid mechanics, the mass and heat transfers or the diffusion of particles and chemical species. The couplings of these transfers phenomena are often badly controlled and require to be analyzed in an analytical, experimental and/ or digital way. The physical model of kinetics adsorption of a gas by a microporous solid, proposed by Mhiri et al, constitutes a base for the comprehension of the mechanism of this phenomenon. This work proposes a physical sense of all terms appearing in this model. In this paper, we underscore the importance of the physical kinetic of gas adsorption by a microporous solid. Using a good choice of pairs, we have determined: the minimal distance from which the interaction forces adsorbate-adsorbent orients the adsorbate molecule to the adsorbent, the existence of a critical temperature and its effect on the relaxation time relative to the adsorbed matter quantity, the underscoring of the adsorbed matter fluctuation in which interval it is active, the determination of the physical meaning of one among the studied values enables to propose a method to determine the interaction force work and to compute it in future works. This paper shows the importance of the model and all the possibilities that allow a deeper study of the mechanism of a gas adsorption by a microporous solid.