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Magdeburg hemisphere
noun
Physics.
- one of a pair of hemispherical cups from which air can be evacuated when they are placed together: used to demonstrate the force of air pressure.
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亚洲网紅露点 History and Origins
Origin of Magdeburg hemisphere1
After Magdeburg, where German statesman and physicist Otto von Guericke (1602鈥86) constructed a pair of such hemispheres
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