You can't stick magnetic things on the left and right sides of the refrigerator because it will affect the heat dissipation of the refrigerator. In order to keep fresh at low temperature, the refrigerator works by the operation of the compressor all the year round, and the function of the left and right sides is to dissipate heat. A refrigerator is an electrical appliance that keeps the temperature low. It can prevent food or other items from deteriorating by keeping them at a constant low temperature. The ancient refrigerator was wrapped in iron, and there was a small hole in the bottom. One of the two cover plates is fixed at the mouth of the box, and the other is a trap, in which ice cubes are put to keep the box low. There are compressors, ice makers, cabinets or boxes for refrigeration, and storage boxes with refrigeration devices in the boxes of modern refrigerators. The volume of domestic refrigerators is usually 20 ~ 500 liters. 19 10 the world's first compressed refrigeration household refrigerator came out in the United States. 1925 Lido Company of Sweden has developed a household absorption refrigerator. 1927 the general electric company of the United States has developed a fully enclosed refrigerator. 1930, air-cooled continuous diffusion absorption refrigerators with different heating methods were put on the market. 193 1 year, a new refrigerant freon 12 was successfully developed. Domestic thermoelectric refrigerators began to be produced in the second half of 1950s, and refrigerators began to be produced in China in 1950s.