紙張燃燒時空氣中的氧氣與紙中的碳和氫結(jié)合并將其中的一部分轉(zhuǎn)換成二氧化碳和水蒸氣。



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選材／校對／翻譯：hqj5715
Have you ever burnt a stack of papers? Maybe a few exams you didn't do so well on in that high school history class and you thought you'd avoid a load of grief from your folks by just burning the evidence? Well, if you weren't doused with water by a parental unit hiding in the bushes, what happened to those papers when you lit them up? Of course burning paper turns it to smoke and ashes and from our everyday experience, whether it's burning old exams or firewood, we typically experience burning in a similar way: when we burn something it gets lighter or, in other words, it loses mass. But this is not true in general! For example, when metals are burned, they actually gain mass! This is because combustion, another word for burning, is actually a chemical reaction which produces heat via a reaction between an oxidant, like oxygen, and some other substance. For example, when paper is burned oxygen from the air combines with carbon and hydrogen in the paper turning some of it into carbon dioxide and water vapor, which waft away with carbon particulates in the smoke.
你是否曾經(jīng)燃燒過一疊紙？也許在高校歷史課堂的測驗中你只有很少做的不夠好并且你應(yīng)該通過燒掉這些證據(jù)你避免承受來自家族的悲痛。 如果你沒有親自將他們浸入水中直到把他們藏入荒地中，當你拿起那些紙屑的時候，將會發(fā)生什么呢？ 當然，從我們?nèi)粘Ｉ畹慕?jīng)驗來看燃燒的紙會變成煙霧和灰燼。無論是燒掉舊的試卷還是柴火，我們都應(yīng)該經(jīng)歷相似的燃燒過程：當我們?nèi)紵骋粯訓(xùn)|西的時候它會變輕或者說，會失去重量。但是這一般是不正確的。 例如，當金屬物被燒灼時，他們是會增加質(zhì)量的。 這是因為，氧化作用，燃燒的另一種說法，實際上是通過與氧化劑的相互作用釋放熱量的過程，例如氧氣或者是其他物質(zhì)。 比如，當紙燃燒時空氣中的氧氣與紙中的碳和氫結(jié)合并講其中的一部分轉(zhuǎn)換成二氧化碳和水蒸氣，而二氧化碳和水蒸氣則以碳微粒存在于煙霧中并飄散。