GPT on Question 7, Oct 3

A refrigerator cools food by moving heat from inside the cabinet to the surrounding room. It does this with a sealed loop of refrigerant, a substance that readily changes between liquid and gas.

The cycle begins in the evaporator coils inside the refrigerator. Cold, low-pressure refrigerant flows through these coils and absorbs heat from the interior. As it absorbs heat, the refrigerant evaporates into a gas, cooling the air around the coils. A fan circulates this cold air through the refrigerator and freezer compartments.

The compressor then pulls in the refrigerant gas and compresses it. Compression raises the gas’s pressure and temperature. The hot, high-pressure gas travels through condenser coils, usually located on the back or underneath the appliance. There, it releases heat into the room and condenses back into a liquid.

Next, the liquid refrigerant passes through an expansion valve or narrow capillary tube. Its pressure drops suddenly, causing it to become very cold. It returns to the evaporator coils, where it absorbs more heat, and the cycle repeats.

A thermostat monitors the refrigerator’s temperature and switches the compressor on and off as needed. Insulation and tight door seals slow the flow of heat into the cabinet, helping the refrigerator maintain a low temperature efficiently. A refrigerator does not create cold; it removes heat from its interior and releases that heat into the room.