The lift pump enigma |
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Aristotle believed that earth, air, fire and water plus a fifth substance called "ether" or "quintessence" were the basic elements that composed all matter. The absolute void cannot exist: for Aristotle "nature abhors a vacuum". The lift pump (see the animation) already used by the ancients seemed to prove this idea. The pump's upstroke creates a vacuum under the piston but, since the vacuum is unable to exist, the water rise to fill the space. When the height that the water needs is less than nine metres, all is normal. The problem is that nature gives up at nine metres! Galileo spent much time to trying to resolve this enigma but he died before discovering the answer. |
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On high: At the bottom:
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