- 期刊
簡易的波以耳定律實驗－111公分玻璃管
An 111-cm Glass Tube for The Representation of The Boyle's Law
摘要
一大氣壓力（＝1033.6公分的水壓）約為十公尺的水柱高，一公尺水柱約為十分之一的大氣壓力，如果在玻璃管內一公尺水深的下方製造一個10公分長的氣泡，依據波以耳定律，氣泡上升後，變為11公分；因此，製做一支一端封閉的111公分玻璃管非常適合定量且定性的演示波以耳定律。實驗的過程中，我們在111公分玻璃管的開口端製造一個長10公分一大氣壓的氣泡，並以手指壓緊；當玻璃管倒立，開口端朝下時，氣泡緩緩上升，氣泡抵達封閉端時，手指承受著氣泡加上水柱的壓力（約為1.1atm）；手指鬆開的瞬間，因氣泡氣壓加上1公尺水柱的壓力需與大氣壓力達成平衡，使得氣泡氣壓瞬間變為原來的十分之九，體積則瞬間增大為原來的九分之十，原長10公分的氣泡變成11公分的氣泡。改變原氣泡長度為9公分，同樣的過程，氣泡變為9.9公分。上述氣泡體積變化的過程完全符合波以耳定律的敘述。此外，氣泡上升時，手指對壓力逐漸增加的承受，與手指離開時，氣泡體積瞬間變大時的刺激感，是探究過程中有趣的體驗。
並列摘要
One atm is about the pressure of 10 m-depth water. The pressure of an one meter glass tube full of water is 0.1 atm. A 10 cm long bubble beneath one meter water in a glass tube elevating to the top of water becomes an 11cm bubble. The Boyle's law can explain this phenomenon. So, we can make an 111-cm glass tube to present the Boyle's law.The glass tube is nearly full of water but an 10 cm air in the open end, When we have a finger to press the open end and then invert the glass tube, The air in the tube become a 10 cm long bubble with one atm pressure inside. This bubble will elevates to the top of the tube , the pressure of bubble and 100 cm column water exerts against the finger is 1.1 atm . As the finger is moved away, some water spills out. The bubble's pressure will be 0.9 atm for the balance against the upward pressure from the atmosphere at the open end. . The bubble's length increases to 11 cm. When we make 9 cm bubble in the same way. We can have a 9.9 cm bubble too. These presentations are the demonstration of the Boyle's law.On the other hand, the finger's feeling from the gradually increasing force when the bubble elevates and the excitement of the oscillations of the long column water as the finger is moved away are interesting in the processing of inquiry.