What is it called when a solid turns into a liquid?

The process of a solid turning into a liquid is called melting. In this process, heat is added to the solid, causing the molecules within the solid to gain energy and move more freely. As the molecules move around and gain energy, they begin to break the bonds that hold them in place and begin to slide past one another, resulting in a change in state from a solid to a liquid. This process requires a specific amount of energy, known as the melting point, which varies depending on the type of substance. Once a solid has melted into a liquid, it can take on the shape of its container and can flow freely, making it easier to pour or manipulate.