Gemini on Question 7, Sep 25

A refrigerator works by transferring heat from its interior to the outside environment, relying on a continuous cycle of evaporation and condensation. It uses a chemical substance called a refrigerant that circulates through a closed system of tubes. The process begins at the compressor, which acts as a pump. The compressor takes in low-pressure refrigerant gas and squeezes it tightly, significantly increasing its temperature and pressure. This hot, highly pressurized gas is then pushed into the condenser coils, which are typically located on the back or beneath the appliance.

As the hot gas flows through the condenser coils, it is exposed to the cooler air of the kitchen. This exposure causes the refrigerant to release its heat into the room and condense into a high-pressure liquid. This liquid then travels toward an expansion valve, which is a small opening that acts as a bottleneck in the system. When the liquid refrigerant is forced through this tiny opening, it enters an area of much lower pressure on the other side. This sudden drop in pressure causes the liquid to expand and cool down incredibly fast, turning it into a very cold mixture of liquid and vapor.

This freezing cold mixture then flows into the evaporator coils located inside the refrigerator compartment. Because the refrigerant is now much colder than the food and air inside the appliance, it draws heat out of the interior space. As the refrigerant absorbs this heat, it boils and transforms entirely back into a low-pressure gas. A fan inside the refrigerator helps circulate the newly cooled air around your groceries. Finally, the warmed, low-pressure gas is sucked back into the compressor, and the entire cycle begins again, continuously pumping heat out of the insulated box to keep your food cold.