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Sat, Oct 4, 14 at 16:26
| I've always wondered why it is required to cover jars in a BWB canner with water; won't water from the canning pot end up in the jars? |
Follow-Up Postings:
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| No. As the liquid and gasses in the jars expand, the gasses are forced out of the jars through the interface between the seal and the jar's rim. If the gasses and liquid inside the jars cool, it creates a negative pressure (partial vacuum) in the jars, which causes the seal to press tightly enough against the jar rim that any external liquid or gasses are prevented from getting through the rim:seal interface. If you take the ring off a sealed jar and heat the contents to near boiling, the seal is readily compromised as the contents approach the boiling point, but you could never cause the seal to fail by cooling it until the jar or seal imploded or the jar was compromised (broken) by expanding ice as the contents froze. Al |
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