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炊烟袅袅是一幅很美丽的图景。但你们知道吗?所谓的烟是混合物,里面包含了二氧化硫、氮氧化物、烟尘、烃类有机物、二氧化碳等一些物质,平均密度要比空气大,也就是说要比空气重。那么为什么烟还在空气中缓缓上升呢?这是由于产生烟雾的过程往往伴随着很多的热空气,是这些热空气带着烟往上升的。我们今天就通过一个小实验,来看到烟确实要比空气重,烟在空气中下降的神奇现象。你们准备好了吗?
Smoke curl is a very beautiful picture. But you know? The so-called smoke is a mixture of sulfur dioxide, nitrogen oxides, soot, hydrocarbons, carbon dioxide and other substances, the average density is greater than air, that is heavier than air. So why is the smoke still slowly rising in the air? This is because the process of generating smoke is often accompanied by a lot of hot air, which is brought up by the hot air with smoke. We passed a small experiment today to see the miraculous phenomenon that smoke really weighs heavier than air and that smoke falls in the air. are you ready?