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形變學 眼界捉迷藏

魔法噴泉

平常受到地心引力的影響,水會從高處往下流;一起來看看如何運用雙手及一根長長的管子,將水從低處的桶子中吸引上來,製造出噴泉的效果!

我們會需要:

  • 透明壓克力管1支(長90公分、口徑2公分)
  • 塑膠水桶一個

起動手跟著做(兩人一組):

  1. 將塑膠水桶裝水至八分滿
  2. 將壓克力管垂直插入水桶中,管子上方用手掌輕壓住但留一點空隙,讓水可以進入管子中(如下圖A)
  3. 接著用手掌將管子完全蓋住,再將管子往上提(如下圖B),管子中的水就會跟著一起往上(如下圖C)
  4. 重複步驟2~3直到水桶的水從管子噴出來(如下圖D~E)

※注意!壓克力管僅限於在水桶中操作實驗,請勿拿起來揮舞,避免造成危險。

 

你有所不知:

管子上方被手掌壓住再往上提時(圖B),由於管子內氣壓小於外在的大氣壓力(呈現半真空狀態),因此管子內大部分的水不會流出去(圖C)。當管子迅速往下並打開手掌時(圖D),雖然管子內的水會因為重力流掉一些,但是由於管子內、外的氣壓一樣,因此不至於全部流光,水就會累積在管子中(圖E)。只要重複以上步驟,水就會很快地在管子中爬升並形成噴泉。

*資料來源自: 科思創科教顧問 許良榮教授 NTCU科學遊戲實驗室

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