Gemini on Question 7, Sep 18

A refrigerator works by moving heat from its interior to the room outside, rather than by directly creating cold air. This process relies on the principles of evaporation and condensation, using a specially formulated chemical fluid called a refrigerant. This fluid circulates through a closed system of tubes and components, constantly changing between a liquid and a gas state to absorb and release heat in a continuous cycle.

The cooling cycle begins at the compressor, which acts as the heart of the refrigeration system. The compressor takes in low-pressure refrigerant gas and squeezes it tightly. This compression raises both the pressure and the temperature of the gas significantly. This incredibly hot, high-pressure gas is then pumped out of the compressor and into the condenser coils, which are the warm metal tubes you can often see on the back or underneath the appliance.

As the hot gas travels through the condenser coils, it is exposed to the cooler air of your kitchen. The heat from the refrigerant radiates outward into the room. Because the gas is losing heat while still under high pressure, it changes state, condensing from a hot gas into a warm, pressurized liquid. This liquid then continues its journey toward the interior of the refrigerator.

The liquid refrigerant is forced through a tiny opening known as an expansion valve or a capillary tube. When the liquid squeezes through this extremely narrow passage and emerges on the other side, it enters an area of much lower pressure. This sudden, drastic drop in pressure causes the liquid to expand and cool down instantly, becoming a freezing cold mixture of liquid and vapor.

This freezing cold refrigerant then flows through the evaporator coils, which are located inside the insulated walls of the refrigerator. As the warm air from your food washes over these cold coils, the refrigerant absorbs the heat from the interior of the fridge. Because heat is being removed from the enclosed space, the air inside becomes cold. As the refrigerant absorbs this heat, it boils and fully evaporates back into a low-pressure gas. This warm gas is then sucked back down into the compressor, and the entire cycle starts over again to maintain a constantly chilled environment for your food.