Final answer:
A rotor chamber in a refrigerator is refrigerated and operates under a vacuum for enhanced cooling efficiency. Refrigeration lowers the temperature inside the chamber, while a vacuum environment minimizes heat transfer and reduces the boiling point of liquids.
Step-by-step explanation:
A rotor chamber in a refrigerator is refrigerated and operates under a vacuum for specific reasons. The refrigeration process helps to lower the temperature inside the chamber, allowing it to absorb heat from the cold reservoir more effectively. The vacuum environment helps to minimize heat transfer through convection and conduction, thereby enhancing the efficiency of the cooling process. Additionally, operating under a vacuum reduces the boiling point of liquids, like coolant, which enables them to absorb heat more efficiently.