I never notice that "牛奶加一些糖会立即滚动,沸腾". I will try it. My expanation is that 糖/咖啡伴侣 is cold while 牛奶/咖啡 is hot, thus the part of 牛奶/咖啡 contacting with 糖/咖啡伴侣 gets densier, so it will 滚动 or 沸腾. |
It should be a common knowledge that if one over heats a cup of water in a microwave and if the water does not boil, then if the water is disturbed slightly, the water may explode, and he may get burnt. I have seen water explosion in such way, luckily did not get burnt. I never tried milk. But you’d be careful if you try. |
if the milk is not very hot, nothing happens. I dare not to microwave the milk for a long time after reading your advice. |
牛奶这个我没见过,但是我做可乐鸡的时候的确有类似的现象。即,把可乐没过鸡,炖,当达到高温的时候,如果这时候加入一把白糖或者一把盐,只听“哗”的一声,可乐翻花,一股白沫涌上来,持续5-6秒。当然了,我估计放一把沙子也是这个现象,唯一不同的是鸡废了。 我是这么理解的:无论是水,牛奶(乳浊液),还是可乐,里边都含气体和微小颗粒。当加热以后,一部分本身自含的气泡涌出来,而颗粒形成的气泡,以颗粒为中心,比较沉一些,悬浮,不是一下子就上涌的。而突然加入了外物(越是微小的颗粒越明显),打破了这个悬浮的平衡,当然,也可能是增加了颗粒气泡的数量,结果一下子造成大量的气泡上涌。而可乐是最明显的。 |
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