Rapid judgment of the quality of liquid nitrogen tank

1 During the use of the jar, the use of the jar should be checked every day. On the premise that there is liquid nitrogen in the jar, it is found that there are drops or frost on the top and top of the jar, indicating that the quality of the jar is problematic. stop using;
2 When the jar cap and the upper waterless beads or frosting phenomenon, touch the shell by hand, the upper part is cold and the lower part is hot, indicating that there is some problem with the quality of the jar, that is, the daily increase of liquid nitrogen is large, so it should be observed and prevented. After the liquid nitrogen is consumed, the stored substances are damaged. If necessary, it is best to stop using them; if the upper and lower temperatures are the same, the quality of the cans is not problematic.
3 After opening the cork, the mist in the bottle mouth does not overflow, but sinks, indicating that the jar is good.
4 Use the ear to hear the sound of bubbles in the jar from the mouth of the bottle. If it is more frequent, there is a problem with the quality of the jar. Otherwise, there is no problem.