The term for the process of converting a liquid to a solid is freezing. During freezing, the temperature of a liquid decreases to its freezing point, allowing molecules to slow down and arrange themselves into a structured solid form. This process is common in water, where it transforms into ice. Freezing plays an essential role in various natural processes, such as the preservation of food and the formation of ice in colder climates, as well as having implications in industries like cryogenics.