第552章 造船匠人老夫包了！
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众人一下被问住了，密度不一样这样的话他们自然说不出来，夏鸿升其实就是在诡辩，误导着他们往自己想要他们得出的结论的方向去。
“贤侄啊。这纸跟铁本就不是同样的东西，那就算是指头尖儿那么大的铁仍旧河里，也浮不起来啊，更何况一千斤？”李孝恭很是不解的问道：“那一千斤的纸若是困在一起扔下河去，照样沉底，除非跟方才贤侄似的，一张纸铺开！”
“对了！”夏鸿升一拍手，笑道：“果然不愧是叔父。立刻就想出来了。”
说完，夏鸿升又一指铜盆中。说道：“大家看，方才沉底的纸现在如何了？”
原本被夏鸿升揉搓成了一团的纸张，此刻吸饱了水，又散开了，于是又慢慢的漂回了水面上。
“漂上来了！父亲你看，飘上来了！”李崇义指着铜盆喊道。
“屁话！老夫知道！”李孝恭对于自己这个很不淡定的儿子很是恼火。觉得他一惊一乍的表面根本没有自己这个大唐名将的风范，于是很气恼。
夏鸿升指着铜盆里面的两团纸说道：“叔叔，你看这两张纸。方才拧成一团的，沉底了，现在它慢慢散开。变大了，于是就又浮起来了。而这张纸一开始就展平着，所以不会沉底。那么咱们是不是可以这一个纸团子大小的铁，也跟展平成一张纸、两张纸、甚至于一百张纸平铺开来那么大，那么它是不是就也可以漂起来了？叔父觉得如何，值不值得一试？”
“这……”李孝恭震惊的看着铜盆里面的连张纸出神起来。
李崇义也是一头雾水，看来夏鸿升的诡辩很是成功，俩人都被夏鸿升给绕晕了。
浸在液体里的物体受到向上的浮力作用，浮力的大小等于被该物体排开的液体的重力。这是著名的阿基米德定律，也就是浮力定律。平常的钢铁都是实心的，所以它沉入水中之后，所受到的浮力就是跟它一样体积的水的重量。而同样体积的水和同体积的铁比，铁的重量自然要比水重的多，按照阿基米德定律，所以就是浮力远小于铁的重力，所以铁就下沉了。而铁船不一样。首先船是有船舱的，船舱里面是空气，再加船体和船底形状的设计，使它下沉到一定程度之后，排开的水的体积会远远大于没入水中的铁的体积了。当排开的水的重量和铁船的重量相等以后，船就不会再下沉了。
刚才的纸团也是一样的道理，夏鸿升把它拧成了一团，它的体积变小了，重量集中，排开的水量就少，少于它的重量，就沉底了。而平铺开的纸张，它的接触水面的地方多，排水量大，就不会沉底了。
夏鸿升现在没法跟他们讲阿基米德定律，所以就只能通过这种方式来引导他们了。
“贤侄说的，倒是新奇的紧。”李孝恭捋须思索了片刻，说道：“倘若要是真能以钢铁造船，那接舢之后，岂不是就不惧敌人水师的火攻，也不怕对方撞船了？”
不愧是大唐名将，自己都还是云里雾里没迷瞪过来怎么回事儿呢，可就先想到钢铁船只在战争中的好处了。
夏鸿升立刻拱手接话道：“叔叔不愧是咱们大唐的名将！举一反三之能，小侄拍马所不及也！听叔叔一说，小侄这才意识到，倘若能够造出钢铁战船来，那还有谁能在水上打得过咱们大唐呐？！他们开着木船，咱们开铁船，要是撞咱们，只怕散架的是他。放火也不怕，钢铁哪里能烧得着？射箭也不怕，箭矢根本射不动船身，更别提将火箭射过来了！”
“不错！不错！是极！”李孝恭吃了一记马屁，顿时笑了起来，捋须说道：“如此说来，若是真能做出钢铁战船来，却是一件大事了！好！老夫当年在江南攻梁，训过水师，造过战船，这手中还真有造船的好手！贤侄放心，此时包在老夫身上，定然找来最好的匠人，协助贤侄试着用钢铁做船出来！”
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