1. 南宫ng·28(中国)官方入口

      Why does the inside of the refrigerator make a sound like "Bang-bang, boom"?

      The sound of "boom" inside the refrigerator is the sound produced by the thermal expansion and contraction of the heat insulation layer (foaming agent). Customers are advised to use it with confidence.(The liquid foaming fluid combines with air to form a solid, which will expand and contract with the change of ambient temperature)