Solid to liquid

The transition from solid to liquid, known as melting, occurs when a substance absorbs heat, causing its particles to gain energy. In a solid, particles are tightly packed in an organized structure, which gives it shape and rigidity. As energy increases, the particles vibrate more vigorously until they break free from their fixed positions, becoming fluid. The substance then transforms into a liquid, with particles able to move freely while still close together. This process continues until all of the solid has melted, resulting in a phase change driven by temperature and energy input.