bell jar

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bell jar

A scientist places a delicate butterfly specimen under a glass bell jar.

Definition

Noun: 1. A bell-shaped glass cover: A transparent, dome-shaped container made of glass, typically used to enclose and protect delicate objects, display items, or cover scientific equipment. It can also be used to contain a specific atmosphere or gas.

Usage

A bell jar is placed over an object to create a sealed or semi-sealed environment. Its primary functions are protection from dust and damage, display, and containment in scientific experiments.

Examples
  • The museum displayed the ancient clock under a large bell jar.
  • In the laboratory, the scientist placed the sample under a bell jar before creating a vacuum.
  • She used a bell jar to protect her delicate porcelain figurine.
Advanced Usage
  • Scientific Context: In laboratories, bell jars are often used with a baseplate to create a vacuum chamber or to contain specific gases for experiments.
    • Example: The reaction was observed inside the evacuated bell jar.
  • Metaphorical Use: The term can be used metaphorically to describe a state of isolation or being cut off from the outside world.
    • Example: Living in that small town felt like being under a bell jar, completely separate from current events.
Variants and Related Words
  • Bell glass: A less common synonym for bell jar.
  • Cloche: A similar bell-shaped glass cover, but typically used in gardening to protect plants or in cooking to cover food.
  • Display case / Display dome: General terms for protective covers used for exhibition.
Synonyms
  • Glass cover
  • Display dome
  • Cloche (in specific contexts)
Antonyms
  • There is no direct antonym, but the concept is opposite to exposure or being uncovered.
Related Idioms or Phrases
  • Under a bell jar: This phrase is used literally to mean physically enclosed by a bell jar. Its metaphorical use, popularized by Sylvia Plath's novel , describes a feeling of suffocation, isolation, or being trapped in one's own mind or circumstances.
    • Example (Metaphorical): After the scandal, the celebrity lived her life as if under a bell jar, shielded from but also isolated from the public.
bell jar

A scientist places a delicate butterfly specimen under a glass bell jar.

Noun
  1. a bell-shaped glass cover used to protect and display delicate objects or to cover scientific apparatus or to contain gases

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