2. The production of carbonated drinks (Sodas) started from the end of18th century to the beginning of19th century. The first discovery began with drinking carbonated spring water that naturally gushed out. That is to say, the predecessor of carbonated drinks is natural mineral water. The study of mineral water began in Italy in the middle of15th century, and mineral water was originally used for therapeutic purposes. Later, it was proved that artificially mixing water with carbon dioxide gas has the same special flavor as natural mineral water containing carbon dioxide gas, which greatly promoted the manufacturing and research process of carbonated drinks. 1772 Priestley, an Englishman, invented the equipment for making carbonated saturated water and became the ancestor of making carbonated drinks. He studied not only the carbonation of water, but also the carbonation of wine and beer. He pointed out that water produces a pleasant taste after carbonation, and it can escape with the fragrance of other components in the water. He also emphasized the medical value of carbonated water. 1807 The United States introduced the fruit juice carbonated water, adding fruit juice to carbonated water for seasoning. This product was popular and started industrial production. Later, with the synthesis of artificial flavor, the preparation of liquid carbon dioxide, the invention of hat-shaped cork and crown cap, and the emergence of mechanized soda production line, carbonated drinks were first industrialized in Europe and the United States and soon developed all over the world.