Which property does the term 'solidification' refer to?

The term 'solidification' specifically refers to the transformation of a material from a liquid state into a solid state. This process is crucial in metallurgy and materials science as it affects the mechanical properties, microstructure, and overall performance of metals and other materials.

During solidification, as the temperature decreases, atoms in the liquid are able to arrange themselves in a more ordered, fixed structure, resulting in a solid. This process plays a vital role in various manufacturing processes, including casting and forging, where the transition of materials is fundamental to achieving the desired properties in the final product.

Other options describe different phenomena that are not related to the actual transition to a solid state. For example, remaining liquid indicates no phase change is occurring, while cooling and heating processes relate to temperature changes rather than the transformation itself.