The mode of action of a refrigerator involves the following steps:
1. Compression: The refrigerator uses a compressor to compress a refrigerant gas, typically a hydrofluorocarbon (HFC) or chlorofluorocarbon (CFC), into a high-pressure, high-temperature gas.
2. Condensation: The compressed gas then flows into the condenser coils located at the back or bottom of the refrigerator. These coils dissipate heat, causing the gas to condense into a high-pressure liquid.
3. Expansion: The high-pressure liquid refrigerant passes through an expansion valve or capillary tube, which reduces its pressure and temperature. This causes the refrigerant to evaporate and turn into a low-pressure gas.
4. Evaporation: The low-pressure gas flows into the evaporator coils located inside the refrigerator. As it evaporates, it absorbs heat from the surrounding air, cooling the interior of the refrigerator.
5. Circulation: The refrigerant gas is then drawn back into the compressor, and the cycle repeats to maintain a consistent temperature inside the refrigerator.
Overall, the mode of action of a refrigerator involves the continuous circulation of a refrigerant, which undergoes compression, condensation, expansion, and evaporation to remove heat from the interior of the refrigerator and keep it cool.