纸张燃烧时空气中的氧气与纸中的碳和氢结合并将其中的一部分转换成二氧化碳和水蒸气。



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选材／校对／翻译：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.
你是否曾经燃烧过一叠纸？也许在高校历史课堂的测验中你只有很少做的不够好并且你应该通过烧掉这些证据你避免承受来自家族的悲痛。 如果你没有亲自将他们浸入水中直到把他们藏入荒地中，当你拿起那些纸屑的时候，将会发生什么呢？ 当然，从我们日常生活的经验来看燃烧的纸会变成烟雾和灰烬。无论是烧掉旧的试卷还是柴火，我们都应该经历相似的燃烧过程：当我们燃烧某一样东西的时候它会变轻或者说，会失去重量。但是这一般是不正确的。 例如，当金属物被烧灼时，他们是会增加质量的。 这是因为，氧化作用，燃烧的另一种说法，实际上是通过与氧化剂的相互作用释放热量的过程，例如氧气或者是其他物质。 比如，当纸燃烧时空气中的氧气与纸中的碳和氢结合并讲其中的一部分转换成二氧化碳和水蒸气，而二氧化碳和水蒸气则以碳微粒存在于烟雾中并飘散。