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'<p style="text-align: center; ">
<img alt="" src="/uploads/allimg/150829/3-150R9145Q2263.jpg" /></p>
<p>
當意識到工作即將遲到的時候，你可能會匆匆忙忙地買上一杯咖啡，然後盡你最快的速度趕向辦公室。只是當你趕到辦公室的時候，手上的一次性杯子裏的咖啡已經濺出蓋子上面的那個小洞，或許你的襯衫上面還會殘留下一些黃褐色的斑點，之後，你就得穿着這件“斑點襯衫”開始一天的工作。</p>
<p>
在RobKaczmarek購買了他最喜愛的咖啡之後，同樣的事情也發生在了他的身上。美國的ConvergentScience公司的市場銷售總監對於“咖啡爲什麼會飛濺出杯子，即使有蓋子蓋着”這個問題非常的感興趣，之後就專門創建了一個關於這個的模型。而想用流體力學計算研究解決這個問題的人們則認爲建立這個模型就是個笑話。“只是因爲蓋子的設計問題”，他解釋道，“這是因爲咖啡在晃動的時候會撞擊到杯子上的蓋子，然後因爲蓋子上面有孔，所以湧動的咖啡就會通過這個孔飛濺出來，而且觀察發現，咖啡通過蓋子上的孔的時候速度是增加的。”</p>
<p>
當然並不是所有的咖啡杯的蓋子上面都有孔的，有些蓋子的設計比較合理，在小孔周圍設計一個凹面，通過這個下陷的結構來抵消杯子裏的液體撞擊蓋子的力度。</p>
<p>
如果杯子蓋子的平面擁有一些角度或者是呈現半球型的，或許就不用擔心咖啡會濺出來的問題了。劍橋大學的物理學家LisaJardine-Wright就曾經考慮過這個問題。“我覺得蓋子應該被設計成和水平呈一定相反的角度。”</p>
<p>
當然，咖啡會濺出來在一定程度上也取決於你走路的速度。2012年的一項研究報告發現，大多數咖啡濺出的情況都是發生在人們踏出第七步和第十步之間。</p>
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