What does Magdeburg hemispheres mean?

Definitions for Magdeburg hemispheres
magde·burg hemi·spheres

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Wikipedia

  1. Magdeburg hemispheres

    The Magdeburg hemispheres are a pair of large copper hemispheres, with mating rims. They 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 by teams of horses in a famous first public demonstration in 1654. The Magdeburg hemispheres were invented by German scientist and mayor of Magdeburg, Otto von Guericke, to demonstrate the air pump that he had invented, and the concept of atmospheric pressure. The first artificial vacuum had been produced a few years earlier by Evangelista Torricelli, and had inspired Guericke to design the world's first vacuum pump, which consisted of a piston and cylinder with one-way flap valves. The hemispheres became popular in physics lectures as an illustration of the strength of air pressure, and are still used in education. The original hemispheres are on display in the Deutsches Museum in Munich. Aside from its scientific importance, the experiment served to prove the recovery of the city of Magdeburg, which a mere two decades earlier had undergone the terrible Sack of Magdeburg - considered the worst atrocity of the Thirty Years' War - when 20,000 of its inhabitants were massacred, and only 4,000 remained at the end of the war in 1648. Otto von Guericke was concerned with both aspects of the experiment, in his double capacity as a leading scientist and as the Mayor of Magdeburg who worked tirelessly to restore the city's wealth.

Wikidata

  1. Magdeburg hemispheres

    The Magdeburg hemispheres are a pair of large copper hemispheres, with mating rims. They 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 by teams of horses. The Magdeburg hemispheres were designed by a German scientist and mayor of Magdeburg, Otto von Guericke, in 1656 to demonstrate the air pump that he had invented, and the concept of atmospheric pressure. The first artificial vacuum had been produced a few years earlier by Evangelista Torricelli, and had inspired Guericke to design the world's first vacuum pump, which consisted of a piston and cylinder with one-way flap valves. The hemispheres became popular in physics lectures as an illustration of the strength of air pressure, and are still used in education. A pair of the original hemispheres are preserved in the Deutsches Museum in Munich.

Chambers 20th Century Dictionary

  1. Magdeburg hemispheres

    mag′de-bōōrg hem′i-sfērz, n.pl. two hemispherical cups from within which, when placed together, the air can be removed by an air-pump to show the pressure of the air on the outside. [Invented at Magdeburg in Germany.]

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Numerology

  1. Chaldean Numerology

    The numerical value of Magdeburg hemispheres in Chaldean Numerology is: 4

  2. Pythagorean Numerology

    The numerical value of Magdeburg hemispheres in Pythagorean Numerology is: 5

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"Magdeburg hemispheres." Definitions.net. STANDS4 LLC, 2024. Web. 12 Jul 2024. <https://www.definitions.net/definition/Magdeburg+hemispheres>.

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