459证明大气压强
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而在窗外偷听的嬴玉则道。“不对啊。我煲了两个多时辰，应该火候到了啊。”
“高压锅的原理很简单，因为水的沸点受气压影响，气压越高，沸点越高。在高山、高原上，气压不到1个大气压，不到1ooc水就能沸腾，鸡蛋是用普通锅具是煮不熟的。在气压大于1个大气压时，水就要在高于1ooc时才会沸腾。人们常用的高压锅就是利用这个原理设计的。高压锅把水相当紧密地封闭起来，水受热蒸发产生的水蒸气不能扩散到空气中，只能保留在高压锅内，就使高压锅内部的气压高于1个大气压，也使水要在高于1ooc时才沸腾，这样高压锅内部就形成高温高压的环境，饭就容易很快做熟了。当然，高压锅内的压力不会没有，要不就成了炸弹。”尚文给众人解释道。
“这个叫大气压原来这么厉害啊！”工人们惊叹道。
“大气压是自然存在的，不是人。”尚文耐心的解释道。
“哦。”众人点头。看到众人还是似懂非懂的样子。尚文认为，看来秦国的物理得急需大踏步的进步。否则的话，如果连大气压强等认识不到的话，那么后面的实验就完全不能做了。因为，就是这个加压和减压，才给了化学一种测试手段，从而从石油，煤炭提馏出大量的化学工业品。这些工业品很多都是武器必须所使用的。
证明大气压强的实验有很多。比如，最著名的就是马德保半球实验。还有托里拆利实验。这个实验测量出了大气压的数值。尚文决定仿效马德保市长，公开做这个实验。
尚文画出一个图纸，让工人们做出来。同时尚文询问关于抽水装置。答案是有的。因为很多地方已经开始使用抽水泵。火车上已经开始使用。只是人们不知道原理。了解这个情况后，尚文决定还是自己制作。
当年马德保实验中使用了橡胶圈。而尚文没有这种材料。尚文先后实验了各种各样的密封材料。秦国的密封材料大部分使用的是石墨，钢圈或者是其他材料。材料中最贵的无疑是树脂，树脂中有大量的松香等。同时也有从动物骨骼中熬出的动物明胶，也就是胶囊。
尚文为了做这个实验，不得不使用了树脂和明胶两种混合物，为了反正实验失败。尚文特别是使用了皮革作为密封材料。
两个十三寸铜球在特殊密封下灌满水合在一起。然后把水抽出，使其成为真空。然后让马拉就行了。但是，现在已经是凌晨。大家不可能都看得见。不得已，尚文只能打开抽水的地方。恢复正常值。没有观众，也就是失去了意义。
不过尚文决定。这个实验在明天下午时分进行。尚文把这个消息通知给各大报社。报社留有专门人员进行值班。他们负责早报，因为每天要在那个大钟指到六的时候。报纸必须发放到订阅的每家每户。
当报社接到这个消息的时候，已经是凌晨四点。报纸的印刷已经开始。为了抢夺消息的有利位置，他们不得不再发一篇专刊。公布这个消息。
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