What state change occurs as the refrigerant absorbs heat in the evaporator?

When refrigerant absorbs heat in the evaporator, it undergoes a phase change from liquid to gas. This process is known as vaporization. In a refrigeration system, the evaporator is where the refrigerant takes in heat from the surroundings or the substance being cooled. As the liquid refrigerant absorbs heat, it increases in temperature and eventually reaches its boiling point, causing it to transition into a gas. This phase change is critical to the refrigeration cycle, as it allows the system to effectively remove heat from the space being cooled, providing the desired cooling effect. The other options represent different phase changes that do not occur during this particular process in the evaporator.