1. Since liquid nitrogen can replace oxygen, the liquid nitrogen tank cannot be placed in an enclosed space.
If they leak, you may suffocate because of lack.
2. Avoid using an elevator with a liquid nitrogen tank and take appropriate precautions to ensure that no one else has done so.
3. Hang a sign on the liquid nitrogen tank, indicating "Warning, please wait for the next elevator, the material being transported is dangerous.
3. Ideally, someone should meet the liquid nitrogen tank upstairs, otherwise it should be avoided to transport liquid nitrogen tanks in the case of a large number of people.