What is defined as the temperature at which melting occurs?

The melting point is the temperature at which a solid turns into a liquid. At this specific temperature, the solid's internal structure undergoes a transition, allowing its particles to move freely, which is characteristic of liquids. This is a fundamental concept in physical chemistry and materials science, as it helps in understanding the thermal properties of substances.

In contrast, the freezing point refers to the temperature at which a liquid turns into a solid, and in many cases, especially for pure substances, it is the same temperature as the melting point. The condensation point is related to the transition of a gas into a liquid. The boiling point is the temperature at which a liquid turns into a gas. Each of these points is significant in understanding phase changes, but specifically, the melting point is the one that directly addresses the transition from solid to liquid, confirming that this answer is accurate.