第99章 饮冰
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“这是……冰？”
徐平和卢生看得目瞪口呆，一时间对长安君惊为天人，要知道这可是五月仲夏啊，大夏天把水变成冰块，简直是神乎其技！最厉害的方术士也办不到啊。
长安君却摇了摇头，一语捅破了这反应的神秘面纱。
“还记得我对汝等说过的冰点么？若周围的气温低于零度，水成冰。而这消石溶于水时，恰恰会吸收大量热量，使水温降低，外面盘上的寒冷传到铜罐，低于零度，罐里的水自然就凝为冰，跟冬天结冰的原理一样，不足为奇。”
方术士师徒面面相觑，说来惭愧，虽然以往他们也拥有过少量硝石用来炼丹，可数量太小，更不可能一个劲往水里加，看其变化。
外面盘里的冰水有毒，吃了肯定上吐下泻，铜罐里却是可以食用的。当时长安君带头放进嘴里嚼了起来，卢生也学着他取了一小块冰放入口中，顿时一股凉丝丝的惬意从舌尖到喉咙再到肺腑，驱走了炎炎夏日，让他浑身毛孔都舒服不已。
然后，这孩子竟擦着眼泪哭了起来：“夫子，想不到，我也能过上仲夏饮冰的日子。”
徐平满脸惭愧，的确，在这个时代，夏日饮冰，那是大富大贵之家才能享受的啊。
《诗经》有言，“二之日凿冰冲冲，三之日纳于凌阴”，意思是说夏历十二月凿取冰块，正月将冰块藏入冰窖，供夏季使用。冰窖类似地窖，，用石材建造在地下，但由于存量小，成本高，一般都是天子诸侯才有得起，还专门设置了一个负责此事的职位，叫“冰人”，掌斩冰，淇凌。
等到夏季，冰人便定期从冰窖中取冰，作为恩赐分发给卿大夫，明月知道，有一篇叫《夏小正》的历书，专门讲了“颁冰”这件事，颁冰时还有献羊羔祭祀的仪俗，可见此事之重要。
于是贵族们喜滋滋地捧着冰回家，再用冰块冰镇食物酒水，与妻子儿女一起享受，坐在高台楼阙上看着炎炎热日下庶民满头大汗，好不惬意……
所以后世普通小学生五毛钱就能享受到的冰棍，放在古时，已是王孙贵胄的特权了……
也难怪卢生尝冰后，竟激动得哭了起来。
质子府内也有冰窖，不过却没存货，女绮心疼长安君炎热难耐，提醒他可以向王室索要。但谒者后胜却说，由于今年临淄格外酷热，进入五月份后，连王室冰窖里的冰都陆续融化了，整个临淄，根本找不到一块冰，齐王和太子都热得不行，所以他也爱莫能助。
女绮有些无奈，谁料长安君却笑了笑说没事，接着便在丹房内带着方术士，自己制起冰来，之后几天里，女绮惊喜地吃到了加了蜂蜜的“刨冰”。
硝石溶入水后可以用降温结晶法或蒸发结晶发再提出来重复使用，所以明月不单要满足自己的需求，还打算拿出去作为夏日的厚礼送人了……
“王宫内齐王太后太子共要送三份，后胜处要送一份，安平君府要送一份，稷下学宫那边，荀、邹、公孙龙三位先生也要各送一份……”
前世身为公务员，明月深深清楚一个道理，交际不是靠自然熟，也不是靠一两次的一见如故，而是靠不断积累的人情往来，几次之后，不熟也熟了。
但如此一来，不但方术士累的够呛，连硝石也不太够了。
“此物真是太稀少了。”眼见产出的冰远远小于需求，明月不由感慨。
除了少数天然的硝石矿外，这东西就只能在阴干的墙角，厕所，猪圈的泥巴里刮取“地霜”，再过滤提纯。
他不由对一直觉得他用硝石制冰是不务正业的徐平说道：“制冰只是附带，这硝石真正的大用途，来日我再教与汝等，先生知道这世上何处硝石最多么？”
徐平回了他一个令人绝望的消息。
“我只知道，天下方术士手里的硝石，大多是从秦国购来的，据说秦汉中郡有一个大硝矿，取之不尽用之不竭……”
“秦国，汉中郡……”明月翻了翻白眼：“秦国禁绝外来商贾，想从秦国内将此物大量运出来，比登天还难，看来十年二十年内，是没戏了。唉，若是和解池产盐一样，这世上能有一个大湖，里面源源不断地产出硝石就好了……”
徐平却奇怪地看看他：“长安君不知么？”
明月一愣：“什么？”
“赵国太原郡原名大卤，有湖泊无数，昭余祁至今烟波滔滔，但一些小湖却已干涸，有的湖床产盐，其中夹杂硝石，虽不如汉中之多，却也不少……”
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