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The reason for bag inflation is that the food in the food packaging bag has deteriorated. After decay, microorganisms will decompose the organic matter in the food to produce gas. Therefore, the volume of solid will be reduced and the gas will be increased, which will cause the bag to expand.
When people buy food, if there is bag inflation and gas inflation, they generally don't buy it, because the food inside has deteriorated and can't be eaten.
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