Diffusion in solids

Diffusion in solids refers to the process where atoms or molecules move from regions of higher concentration to lower concentration within a material. This movement occurs because atoms vibrate and sometimes jump between positions, gradually spreading out over time. Diffusion is important in processes like alloy formation, heat treatment, and material aging, influencing a solid's properties and behavior. It is usually slow compared to liquids and gases due to the tightly packed atomic structure, but it can be accelerated by temperature or the presence of defects in the material.