水中加盐能提速煮沸水这个说法似乎被世界各地很多的厨师所首肯。可是事实真的如此吗?
事实上,烧水过程中加盐恰恰起了相反的作用,不但不会加速煮沸水,还会使这个过程更加漫长。
好了,要说清这个盐与煮沸水之间的关系,我们需要先回忆下初高中时的化学知识:
溶质-solute
溶液中被溶剂溶解的物质。溶质可以是固体(如溶于水中的糖)、液体(如溶于水中的酒精)、或气体(如溶于碳酸饮料中的二氧化碳)。其实在溶液中,溶质和溶剂只是一组相对的概念。一般来说,相对较多的那种物质称为溶剂,而相对较少的物质称为溶质。
溶剂-solvent
溶剂是一种可以溶化固体,液体或气体溶质的液体,继而成为溶液。在日常生活中最普遍的溶剂是水。而所谓有机溶剂即是包含碳原子的有机化合物溶剂。溶剂通常拥有比较低的沸点和容易挥发。或是可以由蒸馏来去除,从而留下被溶物。因此,溶剂不可以对溶质产生化学反应。它们必须为低活性的。溶剂可从混合物萃取可溶化合物,最普遍的例子是以热水冲泡咖啡或茶。溶剂通常是透明,无色的液体,他们大多都有独特的气味。
溶液-solution
由两种以上物质组成的均匀、稳定的分散体系,被分散的物质(溶质)以分子或更小的质点均匀且稳定地分散于另一物质(溶剂)中。
当把盐加入到水中后,一种“沸点升高”的现象就会产生(沸点是指物质沸腾时的温度,更严格的定义是液体成为气体的温度。液体在未达到沸点温度时也会通过挥发变成气体。然而,挥发是一种液体表面的现象,也就是说只有液体表面的分子才会挥发。沸腾则是在液体的整个部分发生的变化,处于沸点的液体的所有分子都会蒸发,不断地产生气泡)。
盐是一种非易于挥发的溶质,相较于纯水来说,需要更多的热量来使之达到沸点,因此,当其被加入到纯溶剂水中后,形成的盐水溶液的沸点也将会被随之提升。
所以各位大厨们,盐只能帮你提升菜肴的口感,至于用来加速烧水么,就没法实现咯~
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