Gemini on Question 7, Oct 2

A refrigerator works not by creating cold, but by absorbing heat from its interior and transferring it to the surrounding room. This process relies on a continuous cycle of evaporation and condensation involving a special chemical fluid called a refrigerant. The cycle begins at the compressor, a pump that acts as the heart of the system. The compressor pulls in warm, low-pressure refrigerant gas and squeezes it, which significantly raises both its pressure and temperature.

This hot, pressurized gas then flows into the condenser coils, which are usually located on the back or bottom of the appliance. As the hot gas travels through these exterior coils, it releases its heat into the cooler air of the kitchen. Losing this heat causes the refrigerant to condense, turning from a gas into a high-pressure liquid.

The liquid refrigerant is then forced through a tiny opening called an expansion valve or capillary tube. As the fluid pushes its way through this narrow passage and emerges on the other side, it experiences a sudden and massive drop in pressure. This rapid depressurization causes the liquid to expand and cool down drastically.

Now a freezing cold fluid, the refrigerant flows into the evaporator coils situated inside the refrigerator compartment. As it circulates through these interior coils, the cold refrigerant absorbs ambient heat from the food and air inside the fridge. Removing this heat is exactly what keeps your groceries cold.

In the process of absorbing the interior heat, the liquid refrigerant completely boils and evaporates back into a warm gas. Finally, this low-pressure gas gets sucked back into the compressor, and the entire continuous cycle begins all over again. A built-in thermostat constantly monitors the internal temperature, turning the compressor on or off as needed to maintain the exact level of chill you desire.