Cui Heung Garden, August 15th.

1. Whether it is food or canned food, it needs to be sterilized. After the bacteria and bacterial spores are eliminated, there will be no more bacterial reproduction. However, it is unlikely to eliminate them all. What can be achieved is basic sterilization, so as to extend the food preservation time as much as possible.

2. There are also a large number of bacteria and bacterial spores in the dust in the air. Bacterial spores are like tree seeds, which are very durable and can float in the wind. So the cans are vacuum sealed.

3. There are preservatives in cans, because bacteria will multiply rapidly in a suitable environment. Even if there is only one bacterium, it can quickly become countless because of fission and reproduction. Preservatives can effectively inhibit the survival of bacteria, making it impossible for the few bacteria to survive, and the food can be stored for a longer period of time.