Refrigerators have been designed to work using different processes. However, most of the modern domestic refrigerators work using a vapour compression cycle. In this type of refrigerator some special gas called a refrigerant is compressed using a compressor. This increases the temperature of the refrigerant. The refrigerant is then cooled to a temperature closer to the room temperature by circulating it in a radiator coil. This compressed refrigerant at near room temperature is then allowed to expand. This brings down its temperature considerably below 0 degrees C. This very cold refrigerant is then circulated through cooling coils inside the enclosed compartment of the refrigerator. The refrigerant after circulation through the cooling coils, is again taken to the compressor for repeating the process of compression, cooling and expansion in a continuous cycle.