Mason jars are made for canning. If you're going to be adding a hot liquid to a canning jar, follow these directions:
Quote:Jar PreparationFill the canner with water and place the jars in the rack. Cover and bring to a simmer over medium heat. Reduce heat and keep jars hot until you're ready to fill them.
Essentially, you need something sitting at the bottom of the pot so the jars dont touch the bottom. The water level needs to be near the top of the jars so that the jar is near completely submerged. Typically in canning/preserving people use a
canning rack. A
metal vegetable steamer works well. Then bring the jars to a medium boil.
Be careful not to burn yourself on the jars.
Canning jars are Soda-lime-silica glass, and have a high coefficient of thermal expansion. They expand or contract "a lot" based on the direction of the change in temperature. So by heating up jars in a medium heat bath, you're allowing the expansion of the jar to happen slowly. When it happens too quickly or unevenly around the jar, the glass is expanding too quickly or too localized.
Pyrex is made out of Sodium Borosilicate. It has a very low coefficient of thermal expansion. Therefor, they contract/expand "very little" with a change in temperature.
Hope this helps!
wearepeople
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