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[[File:PreservedFood1.jpg|PreservedFood1|thumb]] [[File:Boutappertcolljpb.jpg|Boutappertcolljpb|thumb|left]] [[Image:JohnLandisMason.jpg|JohnLandisMason|thumb|left]] [[File:BallBlue.jpg|BallBlue|thumb]] [[File:Mason_jar_array.jpg|Mason jar array|thumb]] [[File:Antique_Mason_jars.jpg|Antique Mason jars|thumb]] '''Mason jar''' refers to a molded [[glass]] jar used in [[home canning]] to preserve [[food]]. Named after John Landis Mason, who patented it in 1858, the Mason jar's design includes a screw-on lid to create an airtight seal, making it ideal for preserving food. The jar's invention revolutionized food preservation, allowing for longer storage periods and contributing significantly to food safety and storage efficiency.

==History==
The Mason jar's history begins with its inventor, John Landis Mason, a [[New Jersey]] tinsmith. In 1858, Mason invented and patented the first version of the jar, which featured a screw-on thread molded into its top and a matching lid. This design was revolutionary because it provided a reliable method to seal jars airtight, a significant improvement over previous food preservation methods. Although Mason's patent expired in 1879, allowing other manufacturers to produce similar jars, the term "Mason jar" has become synonymous with this style of jar, regardless of the manufacturer.

==Design and Usage==
The design of the Mason jar includes several key features that have contributed to its popularity and longevity. The jar itself is made of [[glass]], which does not react with the food inside and allows for the contents to be visible. The top of the jar has screw threads to accept a metal ring or "band." A separate metal disc with a rubber-like seal around the edge, known as the "lid," is placed on the jar before the band is screwed on. When the jar is heated during the canning process, the air inside expands and escapes, creating a vacuum seal as it cools, which prevents air from re-entering and potentially contaminating the food.

Mason jars are used in various [[home canning]] methods, including water bath canning and pressure canning. They are suitable for preserving a wide range of foods, such as [[fruit]]s, [[vegetable]]s, [[jam]]s, and [[pickle]]s. Beyond food preservation, Mason jars have become popular for a variety of other uses, including as drinking glasses, decorative vases, and containers for homemade candles.

==Cultural Impact==
The Mason jar has had a significant cultural impact, especially in the United States, where it is often associated with rural and vintage aesthetics. Its practicality and simplicity have made it a symbol of self-sufficiency and the DIY movement. In recent years, the Mason jar has seen a resurgence in popularity, not only for its traditional use in canning but also as a trendy item for home decor, weddings, and other crafts.

==Modern Variations==
Today, Mason jars come in a variety of sizes, from small 4-ounce jelly jars to large half-gallon jars. They are also available in different shapes and colors, including clear, blue, and green glass. Some modern versions feature a wide mouth design, making them easier to fill and clean. Despite these variations, the basic design and function of the Mason jar have remained largely unchanged since its invention.

==See Also==
* [[Home canning]]
* [[Glass bottle]]
* [[Food preservation]]
* [[John Landis Mason]]

[[Category:Food storage]]
[[Category:Glass applications]]
[[Category:American inventions]]
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Mason jar - Revision history

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