2-3 months, 60-90 days.
1. Taking apples as an example, they are still crispy and delicious after being filled with nitrogen for 8 months. Fruits and vegetables can be stored for 2-3 months at the optimum temperature, but by using nitrogen to remove the oxygen in the storage box, the fruits can be stored for more than a year.
2. Seal and seal the tea leaves and pack them with air and nitrogen. That is, put the tea leaves into a double-layer aluminum platinum (or nylon polyethylene-aluminum composite foil) bag, remove the air and inject nitrogen. After one year, the tea will The quality is fresh, the tea soup is clear and bright, and the taste is pure and fragrant.
3. Nitrogen: The chemical formula is N2. It is usually a colorless and odorless gas, and nitrogen is generally less dense than air.
4. Nitrogen accounts for 78.12 (volume fraction) of the total atmosphere and is the main component of air. Under standard atmospheric pressure, when cooled to -195.8°C, it turns into a colorless liquid. When cooled to -209.8°C, liquid nitrogen turns into a snow-like solid. The chemical properties of nitrogen are inactive and it is difficult to react with other substances at room temperature. However, it can undergo chemical changes with certain substances under high-temperature and high-energy conditions and can be used to produce new substances useful to humans.