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XVii century, Magdeburg experiment
Engraving showing an experiment with an evacuated sphere being carried out at Magdeburg, Germany in 1654. In the demonstration 16 horses ( here only 8 represented) could not pull apart the two halves of an evacuated sphere, which became known … Continued
Chemistry, Woulff bottles to channel gases through liquids
A set of Woulff bottles, commonly used to prevent liquids from entering vacuum pumps, or to channel gases through liquids, trapping hazardous substances and preventing pressure buildup.