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Head Space When canning food, the space between the food and the lid is called headspace. Proper headspace is required for the expansion of food and the bubbling up of liquids during processing. It is also necessary for forming vacuums in cooled jars. Too little headspace can force food out during processing creating an improper seal. Too much headspace can leave remaining air within the jar causing the food at the top of the jar to darken. For jams and jellies, provide 1/4 inch of headspace. For high acid foods leave 1/2 inch. For low acid foods, 1 - 1 1/4 inches. |
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