Question: What is a Ball jar?

Mason jars are also called: Ball jars: in reference to the Ball Corporation, an early and prolific manufacturer of glass canning jars. Fruit jars: for a common content. Glass canning jars: a generic term reflecting their material and purpose. Kilner jars: the major UK manufacturer.

What is the difference between Ball and Mason jars?

The glass is made in the same batch, the only differences are the molds - whether they say Ball or Kerr is only cosmetic. A Mason jar, named after John Landis Mason who first invented and patented it in 1858, is a molded glass jar used in home canning to preserve food.

How do Ball jars work?

Once jars are filled, the metal lids and screw bands are applied, and the jars are placed in a canner filled with water. This difference in pressure pulls the lid down onto the jar and forms a vacuum seal. Heating for the required period of time also kills molds, yeasts, bacteria, and enzymes that may be present.

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