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二氧化碳的密度大,你把一長一短兩隻蠟燭放在一個密封的容器裏燃燒,肯定是短的那只先熄滅,長短差距越明顯越快發現,因為蠟燭燃燒產生的二氧化碳比空氣的密度大,要下沉到底部,所以當二氧化碳沉積厚度大於短的蠟燭時,短蠟燭就先熄滅了.
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