In the process of diffusion, what is the direction of gas movement?

The direction of gas movement during diffusion is from high concentration to low concentration. This process occurs because molecules of gas are in constant motion and naturally tend to spread out to areas where they are less concentrated. When a gas is initially placed in a given space, its molecules will move away from areas where they are densely packed (high concentration) to areas where they are more sparse (low concentration). This movement continues until there is an even distribution of gas molecules throughout the space, achieving equilibrium.

Understanding diffusion is essential, as it explains how gases exchange in biological systems, such as how oxygen enters the bloodstream and carbon dioxide is expelled during respiration. The other options do not accurately reflect this natural tendency of molecules to disperse and achieve balance in concentration. The notion that gas would remain static or move equally in all directions without favoring lower concentrations would contradict the fundamental principles of molecular motion and the behavior of gases.