Minus 18 degrees Celsius to minus 23 degrees Celsius. Freezing means storing food at a temperature below the freezing point. This can extend the shelf life of food, prevent bacteria and microorganisms from multiplying, and prevent the loss of food nutrients. The freezing temperature is set between minus 18 degrees Celsius and minus 23 degrees Celsius. . The first refrigerator that used an electric motor to drive a compressor was invented by Swedish engineers Brighton and Mendes in 1923. Later, an American company bought their patent and produced the first batch of household refrigerators in 1925. , the electric compressor and the refrigerated box of the original refrigerator were separated. The latter was usually placed in the kiln or storage room of the home and was connected to the electric compressor through pipes. Later, the two were combined into one.