In our previous papers - , a path of heat transfer was postulated based on the assumption that the heat transfers from a gas system to the surroundings through some gas molecules undergoing the inelastic collision with the container walls and then liquefy. It gave a new and concise gas state equation for the saturation system of gas-liquid , thereby excluding the classification of the ideal and real gas. Moreover, a new model for the specific heat capacities of gas at the saturation was established . Furthermore, it is consistent with the equations of gas solubilities, gas-liquid interfacial tensions, and interfacial pressures independently derived from the analysis of solvation . Inspired by these achievements and the follow-up thermodynamic equations that will be published, and more importantly, it is independent of class mechanics; therefore, in this paper, I attempt to apply it to mechanics, inverse to the conventional methodology.