Museums often use "vacuum nitrogen-filled sterilization and disinfection machine" to treat and protect cultural relics, that is, after three days in this machine, the nitrogen concentration can reach 99.99%; After sealing for about three days, all aerobic bacteria, anaerobic bacteria and filamentous mold were killed.

Under normal circumstances, nitrogen is a colorless and odorless gas, which is almost insoluble in water; Nitrogen is chemically inert, generally does not react with other substances and does not provide breathing; Nitrogen is used to make nitrogen fertilizer, which can be packed into food packaging bags for preservation. High concentration nitrogen can inhibit the growth of fungi, and liquid nitrogen can be used as refrigerant.