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Hexagonal jar decorated with flowers and birds, late 17th century, porcelain with overglaze enamels, height: 31.1 cm, diameter: 19.1 cm, Metropolitan Museum of Art (New York City)
A jar is a rigid, cylindrical or slightly conical container, typically made of glass, ceramic, or plastic, with a wide mouth or opening that can be closed with a lid, screw cap, lug cap, cork stopper, roll-on cap, crimp-on cap, press-on cap, plastic shrink, heat sealed lidding film, an inner seal, a Tamper-evident band, or other suitable means.
Etymology
The English word "jar" originates from the Arabic word jarra, which means an earthen pot or vessel.[1][2]
Apothecary jar - historically for storage of medicines; made of ceramics or more typically in modern centuries, clear glass. Typically cylindrical or with rotationally symmetric decorative curves, sometimes with a glass disc foot separated from the main body. Modern glass versions are also used for artistic display of the contents.
Modern glass food storage jars come in a variety of shapes, all of which have a circular opening on top for screwing on a lid:[5]
Economy round or wide mouth jars - tall but rotund cylinder slightly rounded at the top and bottom, relatively wide with a wide mouth, commonly used for sauces like a mayonnaise
Paragon jars - tall and narrow cylinder, commonly used for pickled foods like olives
French square or Victorian jars - roughly a small cube
Some regions[In what country?] have a legally mandated deposit refundable upon return of the jar to its retailer, after which the jar is recycled according to the SPI recycling code for the material.[6]
^Ahvenainen; Heiniö, R.-L. (1993). "Factors affecting the suitability of glass jars for heating in microwave ovens. Comparison with plastic jars and paper board tubs". Packaging Technology and Science. 6 (1): 43-52. doi:10.1002/pts.2770060108.
^Yam, K. L., "Encyclopedia of Packaging Technology", John Wiley & Sons, 2009, ISBN978-0-470-08704-6