In diffusion, substances move from areas of:

In diffusion, substances naturally tend to move from areas of high concentration to areas of low concentration. This process is driven by the concentration gradient, which is the difference in the concentration of a substance between two regions. When there is a higher concentration of molecules in one area, those molecules will move into areas where they are less concentrated to achieve equilibrium. This movement continues until the concentration of the substance is uniform throughout the space, leading to a balanced distribution.

This principle forms the basis for many biological processes, such as the movement of oxygen and carbon dioxide in and out of cells, where oxygen diffuses from the blood (high concentration) into the tissues (low concentration) and carbon dioxide moves in the opposite direction. Thus, understanding diffusion is fundamental to various scientific fields, including biology, chemistry, and environmental science.