| 单词 | magdeburg hemispheres |
| 释义 | > as lemmasMagdeburg hemispheres b. Magdeburg hemispheres, a contrivance invented by Otto von Guericke of Magdeburg to demonstrate the pressure of the air.It consists of two strong hollow nicely-fitting brass hemispheres, each of which is furnished with a handle, and one with a cock to be adjusted to an air-pump. When they are fitted together and the air has been exhausted, great force is required to separate them. ΘΠ the world > matter > gas > air > [noun] > air-pressure > device for illustrating Torricellian tube1660 Magdeburg hemispheres1815 bladder-glass1854 1815 in C. Hutton Math. & Philos. Dict. 1858 D. Lardner Hand-bk. Nat. Philos.: Hydrostatics, Pneumatics, & Heat (new ed.) 179 Two of the strongest men will be unable to tear the hemispheres asunder, provided they are of a moderate magnitude, owing to the amount of the pressure with which they are held together. < as lemmas |
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