Submitted by GotYaSon1 t3_yifsxz in explainlikeimfive
valeyard89 t1_iuietqd wrote
Bacteria are usually what cause food to spoil, but they may require oxygen. The jars are pasteurized (sterilized) and sealed during production, this kills any existing bacteria and keeps others from getting in. Once you break the seal, the microbes floating in the air can get in it and cause it to spoil.
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