Pickling pickles is the process of processing vegetables by lactic acid bacteria, which are anaerobic bacteria, that is to say, pickling pickles should be carried out under the condition of isolating air. A bowl is upside down on the circular sink. After adding a proper amount of water, the sink is divided into two containers with communicated bottoms by the bowl rim, that is, the communication device. According to the principle of communicator, the water surface inside and outside the bowl rim is horizontal. So the air inside and outside the altar was separated by water. Air can't enter the jar, which ensures the normal chemical changes in the jar.
In addition, the chemical change in the cylinder produces gas, which can also be discharged from the cylinder through the water at the bottom of the annular water tank when the air pressure in the cylinder is greater than that outside the cylinder.
It can be seen that the annular water tank has two functions of isolating air and one-way valve, which plays a key role in the pickling process of kimchi. If your family uses a pickle jar to make pickles, don't forget to add water to the circular sink. Because the sink is shallow and can't hold much water, it is easy to evaporate, which makes the gas inside and outside the pickle jar communicate with each other and makes the pickle soup moldy and grow a layer of white hair. What a pity!