Reason:
1. Keep the inside of the refrigerator at about 4℃ so that the food stored in the refrigerator can be preserved for a long time. If you put hot things directly into the refrigerator, the temperature in the refrigerator will rise, which can not meet the condition that the inside of the refrigerator should be kept at about 4℃, and the food stored in the refrigerator is easy to deteriorate.
2. When hot things are put into the refrigerator, part of the heat is brought into the refrigerator, and the refrigerator needs to work to reduce the temperature, which requires power consumption, increasing the burden of the refrigerator, thus reducing the life of the refrigerator.
3. Because the temperature in the refrigerator is low, when the hot food becomes cold, the water contained in it will evaporate quickly and then solidify on the internal evaporator, which can form a thick frost layer on the evaporator in a short time, preventing the evaporator from transferring the heat in the refrigerator to the outside.