第599章 岂惧足履霜(1)
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韩冈一笑，知道吕惠卿多半是有些受害妄想症，对自己猜忌过甚，也许转了年过来，他就要找个由头来整治自己了，以便将祸患提前给排出，故而才惹得章惇如此火急火燎。不过也有可能是吕惠卿故意摆出要针对自己的姿态，好引得章惇过来探底，至于章惇，或许也有顺水推舟的成分在。
可不管是什么情况，韩冈的计划无可不对人言，本来就是阳谋，无人能挡得了，并不需要多猜测对方的心思。随即站起身：“请直院随韩冈来。”
章惇半带着疑惑，随着韩冈一路走到书房中。
分了宾主落座，章惇打量着房内。韩冈书房的布置十分朴素，并没有多少摆设，仅仅用石灰粉了墙壁。房中的藏书也并不算多，刚刚摆满了一边墙壁的书架而已。靠着窗户的书桌，则是摆着文房四宝和几册书卷，整理得十分整齐。且又有淡淡的幽香漂浮在房中的空气中，这不是薰香的味道，而是女子所用的香粉味道，看起来韩冈添香夜读书的生活，过得很是惬意。
只是在房中的圆桌上，却放着一个木盆，大小像是用来洗脚的。出现在书房中，让人感觉很是别扭。而盆中还盛着水，水面上飘着一块木头，还有一艘雕工十分粗糙的小木船。
“这是？”
看见盆中的木舟，章惇就想起了韩冈对他说过的话，那个‘船’字是不是就应在这里。
韩冈拱了拱手：“韩冈想请教直院，不知直院可知为何木舟能浮于水上？”
章惇知道韩冈不会白白发问，左思右想却想不透韩冈问话的用意，以及陷阱何在，犹犹豫豫的说道：“因为木头比水轻……”
“说的没错。不过确切的一点说，应该是同样体积的木头要比水要轻。不能说这张桌子，比盆里的水要重。固定体积的重量，我称之为密度。比如说一升水，一升银，一升铁，一升木头的重量都不一样，也就是说它们密度都不尽相同。”
对于各种单位的定义是物理学的重点。重量、质量的差别暂时还不便提出来，但密度、速度等单位，就必须加以明确定义。
章惇听着点点头，虽然没有完全明白，但大体意思还是了解了，“也就是说密度比水轻的会浮在水上，而比水重的，会沉在水底？”
“正是这个道理！石头密度大于水，所以沉于水底，而油密度小于水，故而浮在水面。”韩冈很欣慰的说着，他这两天给妻妾灌输密度的定义，可是费了一番功夫。不比章惇，说了就明白了——自然，其中也是因为有了经验的缘故。
韩冈拿起桌上的一个小银碗，丢进盆中。只见着银碗浮在水面上飘飘摇摇，“现在问题来了。银的密度远比水要大，也就是同样大小的银要比水重得多，那为何银碗能浮于水上？”
“银碗中空，压平了就沉水了。”章惇沉吟了一下，方才给出了回答。抬眼反问韩冈，“此一答当是人尽皆知。”
“的确，银碗能浮于水上，就是因为中空之故。所以将银碗改成铜碗，也当同样能浮于水上。”
“自是当然。”章惇的回答越来越干脆。
韩冈点了点头，又问道：“如果换成铁呢？”
“铁？铁碗……不对，是铁船！”章惇终于反应过来，猛然间蹦起，目瞪口呆的指着韩冈，“玉昆！你这是要打造铁船？”
“只要算准了船只的自重和尺寸，行驶在水上的铁船也的确能造得出来。不过这仅仅是一部分而已，辨明了其中的道理，能造的东西多了，可不仅仅是铁船。”韩冈看着章惇的目光宁宁定定，“直院可知其中道理何在？”
章惇坐了下来，沉声道：“玉昆，你就别卖关子了，直说好了。”
章惇对韩冈一心倡导格物致知之说的坚持，其实也算是挺佩服的。当初韩冈在御前亲手验证了轻物重物同时落地，将格物之学搬上台面。章惇在荆南听说之后，对此也生了兴趣。但当他回去对着院后的一从竹子看了一个晚上，怎么也格不出个眉目。竹子随风而摆，吟诗作词不难，可换成是格物，却到底要格个什么？章惇想不出来，脑筋也始终转不过来。
韩冈倡导的学术，看似平平常常，平日里都随处可见，可只有说破了才让人恍然大悟。章惇已经放弃了在这上面花费时间和精神，他要做的事太多，可没有韩冈分心多用的本事。
韩冈微微一笑，将摆在桌上的一叠绢纸装订而成的册子递了过去，封皮上只有简简单单的四个字——《浮力追源》。
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