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Bell jar
Glass jar used in scientific experiments / From Wikipedia, the free encyclopedia
A bell jar is a glass jar, similar in shape to a bell (i.e. in its best-known form it is open at the bottom, while its top and sides together are a single piece), and can be manufactured from a variety of materials (ranging from glass to different types of metals). Bell jars are often used in laboratories to form and contain a vacuum. It is a common science apparatus used in experiments.[1] Bell jars have a limited ability to create strong vacuums; vacuum chambers are available when higher performance is needed. They have been used to demonstrate the effect of vacuum on sound propagation.
![]() Early 20th century bell jar with a vacuum pump | |
Uses | Enclosing objects, containing gases or a vacuum |
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In addition to their scientific applications, bell jars may also serve as display cases or transparent dust covers. In these situations, the bell jar is not usually placed under vacuum.