第692章 讲解原理
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不过，李世民知道归知道，但是夏鸿升不说，若非必要，他也会装作不知，不会明着问。这是二人的默契之一。
热气球落下来，袁天罡一刻没停就带着道童离开了泾阳，直奔长安而去了。想来，精明如他，亦知道皇帝耳目之广，这事儿是瞒不住的，不如早些告知于他，消了疑虑。
送走了袁天罡，可是书院的学子们仍旧激动未消。
飞到天上去！
这是多么神玄的一件事情！
而今在他们的眼前，被他们亲眼见证了。
光是为这个，这泾阳书院就算没有白来了吧！
所有学子之间的话题都在围绕着这个热气球，自然，也有人忍不住问了出来。
“先生，您是如何想到做出个这么样的东西来，能飞上天去呢？”晚上的自习课上，就有学子提问了。
不懂就要问，我知道了给你讲，我不知道了咱们一起探讨。这是泾阳书院的良好校风之一。
“说道这个，那就涉及到一个咱们还没有讲过的原理了。”夏鸿升笑着对众人说道：“不知道大家有没有注意过，有时候冬天咱们烤火，在火焰上面似乎可以看到一些扭曲，有时候把纸扔进火力，又或者比较轻的草灰，就会随着火焰升起来，在火焰上面飘。有谁注意到过这个现象？”
“学生知道！”那学子点了点头：“烧火的时候，有些细碎的杂物会飞起来。有时候纸被点着的时候，纸屑也会飞起来。”
不少学子也都点头表示自己知道。
“那你们有没有想过，为什么烧纸的时候那些纸屑会飞起来呢？”夏鸿升笑问道。
“因为太轻了！”学子们答道。
夏鸿升笑了笑，随手从自己手中的教科书上撕下了一小片儿纸，放到了手中，问道：“这片儿纸这么小，很轻吧？为何它现在没有飞起来？”
“这……”一众学子一时无语。
“之前咱们讲过，一个物体，若是要动起来，则必须有一个施加到它身上的力。”夏鸿升继续说道：“纸屑之所以能够飞起来，是因为在它的下方有一个向上的力，这个力大于纸屑自身的重量，所以可以托起纸屑来，让纸屑飘着空中。诸位想一下，这个力来自哪里？”
“来自……”底下的学子想了想：“火？”
“呵呵，的确跟火有关。”夏鸿升点了点头，笑道：“确切来说，这个力来自于被火加热后的空气。空气，之前咱们讲过，无处不在，咱们吸气吐气的，都是空气。而空气被火加热之后，热空气会上升到冷空气上方。从本质上讲，热空气比冷空气轻，因为单位体积热空气的质量较小……”
循序渐进，渐渐引导，夏鸿升将热气球之所以能够飞起来的原理娓娓道来。
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