Last Updated
：2025/11/29
Magdeburg hemisphere
Noun
historical
Japanese Meaning
歴史的な実験装置の一つ。大きな銅製の半球が一対になっており、縁が互いに噛み合う形状をしている。これらはグリースで密閉された状態で空気を抜くことにより内部が真空になり、大気圧によって互いに押し合って引き離すことができなくなる性質を示す。
Sense（1）
（ plural ）
Quizzes for review
(historical) Either of a pair of large copper hemispheres, with mating rims, that were used to demonstrate the power of atmospheric pressure. When the rims were sealed with grease and the air was pumped out, the sphere contained a vacuum and could not be pulled apart even by teams of horses.
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Magdeburg hemisphere
At the museum the curator rolled out a Magdeburg hemisphere to demonstrate how atmospheric pressure could keep two copper halves firmly sealed.
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At the museum the curator rolled out a Magdeburg hemisphere to demonstrate how atmospheric pressure could keep two copper halves firmly sealed.
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