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- Dictionarybell jar
noun
- 1. a bell-shaped glass cover used in a laboratory, typically for enclosing samples.
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noun
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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. Wikipedia