What is the temperature and pressure at which a solid turns into a liquid called?

The term that describes the temperature and pressure at which a solid transforms into a liquid is known as the melting point. At this specific point, the energy supplied to the solid increases its molecular motion to a level where the rigid structure of the solid begins to break down, resulting in the formation of a liquid. This concept is crucial in various fields, including chemistry and material science, as understanding melting points helps in identifying the properties of substances and their suitability for particular applications.

The other terms are associated with different phase changes: the boiling point refers to the temperature at which a liquid turns into a gas, the freezing point is the temperature at which a liquid becomes a solid, and the sublimation point involves the transition from solid directly to gas without becoming liquid. Each of these concepts plays a distinct role in thermodynamics and material behavior, but it is the melting point that specifically indicates the transformation from solid to liquid.