concentration gradient

A concentration gradient refers to the difference in the amount of a substance in one area compared to another. Imagine a crowded room where people are gathered in one corner while the rest of the room is empty. The area with more people has a higher concentration, while the empty area has a lower concentration. Substances naturally move from areas of higher concentration to areas of lower concentration in processes like diffusion, much like people would spread out to fill an empty space. This movement helps balance the concentration throughout the space over time.