What does a refrigerator compressor do and how does it contribute to the cooling process of a refrigerator?

The refrigerator compressor is a device that pressurizes and circulates refrigerant gas throughout the cooling system. It plays a crucial role in the cooling process by compressing the gas, which increases its temperature and pressure. As the hot, pressurized gas flows through the condenser coils located outside the refrigerator, it releases heat and cools down, turning into a high-pressure liquid. This liquid then flows through an expansion valve, where it expands and evaporates into a low-pressure gas, absorbing heat from the interior of the refrigerator and keeping it cool.