Quick Answer
To choose the right size jar for pressure canning, select a jar that is at least 1 inch taller than the liquid and headspace to allow for expansion during processing and cooling. Choose a size that fits comfortably in your pressure canner, but not so large that it leaves excessive empty space. Use a jar that is specifically designed for pressure canning.
Choosing the Right Size Jar
When selecting a jar for pressure canning, the size of the jar is determined by the amount of food to be processed. For example, a pint (16 ounces) jar is suitable for small batches of items like jam or pickles, while a quart (32 ounces) jar is better suited for larger batches like soups or stews.
Jar Height and Head Space
It’s essential to choose a jar that is at least 1 inch taller than the liquid and headspace. This allows for expansion during processing and cooling, preventing the lid from becoming dislodged and ensuring safe sealing. A general rule of thumb is to add 1 inch of headspace for every 1,000 feet of altitude.
Canner Capacity and Jar Size
When choosing a jar size, consider the capacity of your pressure canner. A larger canner can accommodate larger jars, but smaller jars can be used in smaller canners. For example, a 16-quart canner can handle 7-8 quart jars, while a 20-quart canner can handle 9-10 quart jars. Always follow the manufacturer’s guidelines for jar size and canner capacity to ensure safe and effective canning.
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