Pressure canning is the only safe method of preserving low-acid foods. Low-acid foods include vegetables, meats, fish, and poultry. Pressurized steam creates the needed temperature of 240 degrees Fahrenheit or higher that will destroy the bacterial spores naturally present in these foods. As the jars cool, a vacuum is formed, sealing the food in the jars and preventing any new microorganisms from entering and spoiling the food.

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