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Grandma's peanuts were originally vacuum packed, but when they were bought back, they were sealed with air. How long will the shelf life be shortened?
Vacuum-packed food can keep fresh because there are no microorganisms in the food and there is no air for the growth and reproduction of microorganisms. So it can be kept fresh for a long time.
Generally, bacteria and other microorganisms are killed by high temperature first, and then the packaging bag is vacuumized, so that it can keep fresh.
But this vacuum is only relatively little air, not absolutely nothing. ...