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第19章 珍羞美食(1 / 2)

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硝石,即为硝酸钾,溶解于水时,会吸收大量的热能,造成周围环境温度降低,甚至可达零度以下,这便是硝石制冰法的原理所在!据说,这种办法,是唐代开始,出现于记载中,是人们在制作火药的时候,无意间发现的一种现象!

那么,这种制冰法,又是刘纬带到汉代的?他也是受到左慈的启发,才想起来的!其实这种制冰方式,左慈早就会,所谓“点水成冰”的法术,利用的就是这种原理!

左慈在历史上,之所以是个牛人,是因为他的确与众不同,会不少奇异法术,令世人无法理解,以为神迹!

不过,依刘纬看来,左慈应该是个古化学家和魔术师,他也见识过左慈的许多法术,其中有一些,属于魔术范畴,刘纬也解释不了,但有一些,就纯粹是化学原理!

比如这种“点水成冰”的法术,就算刘纬只是个文科生,也大概懂得其中原理,并受到启发,将这种制冰技术加以改进,应用于实际!

硝石制冰,用来降温可以,却食用不宜,容易中毒!于是刘纬便发明了以小盆套大盆的方式,把食用冰与硝石隔离开来,便能获得安全可以食用的冰块了!

因为制作火药,需要大量硝石,如今蜀中的硝石产量极大,那个时代可不像现在,许多自然资源都是未经开采和利用的状态,蕴藏量十分丰富,可谓应有尽有,取之不尽用之不竭!

因此,以硝石制冰,成本并不算高,却可以解决蜀中人们消暑降温和食品保鲜等多种问题,用途广泛,一经推广,大受欢迎,就连普通百姓夏天时,都好像有了个冰箱一样,生活质量直线上升!

同时,硝石也因此由一种简单的战略物资,转变为用途广泛的重要生产生活资料,而行成了一条经济产业链,为惠及更广泛的民众,又增添了一丝助力!

所以,曹节以为惊叹的奇迹,目前在蜀中早已普及!不过有个问题,这样的秘术,刘纬推广应用于民间,难道就不怕被曹操和刘备他们偷偷学去?

还真不怕!学去又能怎么样呢?无非就这些当权者和显贵阶层,多了个夏天消暑降温的技巧罢了,于国计民生并无益处,更无法广泛普及!

刘纬制出了火药,并用于军事,需要硝石为生产原料,便能形成产业链条,大量开采运输硝石;可曹操他们呢,主要使用火油武器,并没有火药,硝石这东西对他们来说没别的用途,仅仅拿来制冰,那得赔死,成本都够不上!

其实,这也是刘纬不怕敌人和对手,学去某些技术的原因所在,因为他们即便学会了,也很难实际应用!

刘纬治下的蜀中,商品经济和手工业发达,这是许多技术应用的基础,而曹操和刘备孙权他们呢,因为没有这种基础,就算学会了,也难以应用于实际,或者无法大规模产出,或者成本极高,他们承受不起!

不过,曹节目睹了这制冰技术的好处,可真往心里去了,她暗自记下了整个流程,还仔细打听了一下那怪模怪样的石头,究竟是什么后,默默铭记于心!

曹节此女……怎么说呢,可谓是集中了所有女人身上不应该有的缺点于一身,不仅脾气暴躁,一身的公主病,还是个人在夫家,心向娘家的主!

《三国演义》中,曹节怒斥华歆,痛骂兄长曹丕篡位的情节,读来着实令人动容,可正史上的记载,却完全相反,她怒斥的不是华歆,却是汉献帝刘协!

那时候,刘协不肯禅位,躲在后宫不见人,曹节便怒斥刘协,说若非她父兄保全,你小子早就没命了,如今让你禅位,也是顺天应人之举!

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