Mason Jar

Term	Definition
Mason Jar	A glass jar that is suitable for heat processing food and/or liquids using a boiling water canner or a pressure canner. Mason jars are designed to seal with two-piece metal closures and to withstand the temperatures and reuse associated with fresh preserving. True mason jars also conform to specific shapes and capacities compatible with established safe heat processing methods and times. The jars are available in regular mouth (70 mm) and wide mouth (86 mm) styles and in capacities ranging from 4 ounces (125 mL) to 1 quart (1 L). Most mason jars have rounded shoulders, but some have straight walls. Straight-walled mason jars can be used for freezing as well as fresh preserving. See also straight walls.

Term

Definition

A glass jar that is suitable for heat processing food and/or liquids using a boiling water canner or a pressure canner. Mason jars are designed to seal with two-piece metal closures and to withstand the temperatures and reuse associated with fresh preserving. True mason jars also conform to specific shapes and capacities compatible with established safe heat processing methods and times. The jars are available in regular mouth (70 mm) and wide mouth (86 mm) styles and in capacities ranging from 4 ounces (125 mL) to 1 quart (1 L). Most mason jars have rounded shoulders, but some have straight walls. Straight-walled mason jars can be used for freezing as well as fresh preserving. See also straight walls.