solid-liquid transitions

Solid-liquid transitions, like melting, occur when a substance absorbs enough energy to change from a rigid, organized solid to a fluid, disorganized liquid. During melting, the structure of the solid breaks down, allowing particles to move more freely. This process depends on temperature and pressure, with the melting point being the specific temperature at which solid and liquid coexist in equilibrium. Once the solid absorbs enough heat, it transitions to a liquid; removing heat reverses the process. These transitions are fundamental to understanding how materials change states in various natural and industrial processes.