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Nitrogen is used to protect the atmosphere in food nitrogen filling and preservation: Nitrogen is the main component of air. It is a colorless, odorless, non-toxic and non-flammable gas at room temperature and atmospheric pressure. The boiling point is -195.8 °C, and its chemical properties are inactive. In addition to synthetic ammonia, nitrogen is usually used as a protective gas for metallurgy, chemicals, coal, food, medicine, electronics, magnetic materials, transportation, heat treatment, tires, thermoelectricity, aviation and other industries. Cake, bread, potato chips, biscuits, essence, tea, instant noodles, yolk pie, coffee beans, beer, red wine, beverages, mineral water, grain production, grain warehouse storage, and vegetable preservation.