Common refrigerants include:

* R-134a (HFC-134a): A popular choice in modern refrigerators, known for its environmental friendliness.

* R-410A: Another widely used refrigerant, often found in newer models.

* R-290 (Propane): A natural refrigerant with a low global warming potential.

* R-600a (Isobutane): A natural refrigerant, often used in smaller refrigerators and freezers.

How they work:

The refrigerant circulates within the refrigerator system, undergoing a cycle of evaporation and condensation.

1. Evaporation: The refrigerant absorbs heat from the inside of the refrigerator, causing it to evaporate and become a gas.

2. Compression: The gas is compressed, which raises its temperature.

3. Condensation: The hot gas releases heat to the outside environment, condensing back into a liquid.

4. Expansion: The liquid refrigerant expands, causing it to cool down and complete the cycle.

This cycle continuously removes heat from the refrigerator, keeping it cool.