Here's how it works:
* Refrigerant: A special liquid called a refrigerant is used. It has a low boiling point and can easily change between a liquid and gas state.
* Absorption of Heat: The refrigerant absorbs heat from the inside of the refrigerator, making the air inside colder.
* Evaporation and Compression: As the refrigerant absorbs heat, it evaporates and turns into a gas. This gas is then compressed, which raises its temperature.
* Release of Heat: The hot compressed gas is then released outside the refrigerator, where it releases its heat into the surrounding air.
* Condensation and Expansion: The refrigerant cools and condenses back into a liquid, releasing more heat outside. The liquid is then expanded, lowering its temperature, and the cycle starts again.
Common refrigerants:
* Freon (R-12) was commonly used, but it's now banned due to its harmful effects on the ozone layer.
* Hydrofluorocarbons (HFCs) are now widely used as refrigerants.
So, refrigeration relies on the unique properties of these liquids to absorb and release heat, creating the cooling effect we rely on in our homes and businesses.
