Should a top on a jar pop when you open it?

Yes, a top on a jar should pop when you open it if the jar was properly sealed and vacuum-packed. This popping sound indicates that the vacuum seal has been broken, which helps ensure the contents are preserved safely. If there is no pop, it may suggest the jar was not sealed correctly or that the contents could be spoiled. Always inspect the jar for any signs of damage or spoilage before consuming its contents.