Gemini on Question 7, Sep 21

A refrigerator works not by creating cold air, but by absorbing heat from the items inside and releasing it into the surrounding room. This process relies on a continuous cycle involving a chemical called a refrigerant, which constantly changes between a liquid and a gas as it travels through a closed loop of copper or aluminum tubes. The journey begins at the compressor, a pump typically located at the bottom of the appliance. The compressor pulls in warm refrigerant gas and squeezes it tightly, which significantly raises the pressure and temperature of the gas.

This extremely hot, pressurized gas is then pushed into the condenser coils, which are usually located on the back or underneath the refrigerator. As the hot gas flows through these exterior coils, it releases its heat into the cooler air of your kitchen. Losing this heat causes the refrigerant to cool down and condense into a high-pressure liquid.

This liquid then travels toward the expansion valve, which is a very narrow opening in the tubing. When the liquid is forced through this tiny space, it experiences a rapid drop in pressure. This sudden depressurization causes the liquid to expand and cool down drastically, turning it into a freezing cold mist.

This cold mixture then flows into the evaporator coils, which are situated inside the refrigerator compartment. Because heat naturally moves from warmer areas to colder ones, the heat from your groceries and the air inside the fridge transfers through the metal coils and into the freezing refrigerant. As the refrigerant absorbs this interior heat, it cools the inside of the refrigerator while boiling back into a warm gas.

Finally, this warm gas flows back down to the compressor. The entire cycle continuously repeats, pumping heat from the inside to the outside, until the internal thermostat detects that the desired cold temperature has been reached and temporarily shuts the compressor off.