Submitted by GotYaSon1 t3_yifsxz in explainlikeimfive
wpmason t1_iuifagj wrote
The canning process kills bacteria with heat (the jars are “cooked” in hot water) and then vacuum seals the food so there’s no oxygen to give life to any remaining bacteria to live on.
The little pop when you open a jar for the first time is you breaking the vacuum seal and letting fresh air in for the first time since the food was put in there.
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