What is a Mason Jar
A Mason jar — named after John Landis Mason, who patented it in 1858 — is a molded glass jar used in home canning to preserve food. The jar’s mouth has a screw thread on its outer perimeter to accept a metal ring or “band”. The band, when screwed down, presses a separate stamped steel disc-shaped lid against the jar’s rim. An integral rubber ring on the underside of the lid creates a hermetic seal. The bands and lids usually come with new jars, but they are also sold separately. While the bands are reusable, the lids are intended for single-use when canning. Glass jars and metal lids are still commonly used in home canning while they have been largely supplanted by other methods for commercial canning (such as tin cans and plastic containers).
In the United States, standard-size Mason jars are made of soda-lime glass and come in two shapes: regular mouth, 2 3⁄8 in (60 mm) inner and 2 3⁄4 in (70 mm) outer diameter, and wide mouth, 3 in (76 mm) inner and 3 3⁄8 in (86 mm) outer diameter, versions. They are produced in a variety of volumes, including cup (half-pint), pint, quart, and half-gallon.
In home canning, food is packed into the Mason jar, leaving some empty “head space” between the level of food and the top of the jar. The lid is placed on top of the jar with the integral rubber seal resting on the rim. A band is screwed loosely over the lid, allowing air and steam to escape. The jar is heat sterilized in boiling water or steam and the lid is secured. The jar is then allowed to cool to room temperature.
The cooling of the contents creates a vacuum in the head space, pulling the lid into tight contact with the jar rim to create a hermetic seal. Once cooled, the band is removed to prevent residual water between the jar threads and the lid from rusting the band. If the jar seal is properly formed, internal vacuum will keep the lid tightly on the jar. Most metal lids used today are slightly domed to serve as a seal status indicator. The vacuum in a properly sealed Mason jar pulls the lid down to create a concave-shaped dome. An improper or failed seal or microbial growth will cause the dome to pop upward.
Mason Jar decoration Ideas
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DIY Mason Jar Table Lamp
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l
Mason Jar Lanterns for Outdoors
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DIY Frosted Stencil Jar Art
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Magical Fairy Garden Mason Jars
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Frosted Mason Jar Vase Lineup
Bedazzled Glowing Jar Lights
Candles for Any and All Occasions
Creative and Customizable Jar Covers
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Next Step: The Lampshade
Mason jars: They’re not just for harvesters and weddings anymore. Yes, you can still use mason jars when your garden is ripe, and you need to preserve, jelly, and pickle your favorite fruits and vegetables (if you do, you are certainly welcome to drop off your extras with us.) And of course, they still provide the casual-but-elegant vibe for centerpieces and favors at shabby-chic wedding.
But mason jars can do so much more, too. That’s because they’re endlessly versatile, and you can use them — and their components — in every room of your house. Turn them into indoor planters and vases, or outdoor bird feeders and citronella candles. Use them to organize your beauty supplies, your spices, and all the bits and bobs in your sewing room. Keep a couple extras in the kitchen as a baking dish for the best single-serve dinner roll you’ve ever eaten — or even a makeshift tart pan. You’ll never run out of uses for them. That’s because mason jars are the perfect size to hold just the right amount of something — it’s not too much or too little — and you’ll always have an extra corner here or there to stash them in. (And, if not, give them as gifts!) Take on one of these mason jar crafts, and you’ll always have a space for everything.
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