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一个生活小常识,要看!(此现象称为突沸)(转贴)


elina

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五天以前我一位朋友决定要泡一杯即溶咖啡,他将一杯水放在微波炉加热(这种动作他曾经做过无数次了),我不确定他设定加热几分钟?但他告诉我他要水加热到沸腾的程度,当微波炉加热完毕,他将那杯水拿出来,当他看了那杯水后他发现水并没有沸腾,但就在那瞬间,那杯水在他的脸上爆开来,杯子保持完好无缺,直到他将那杯水丢出手中,但由于庞大的能量使得所有的水都飞溅到他的脸上,他整个脸上都起了水泡并且至少有1度及2度的灼伤,而可能留下水泡的痕迹且他的左眼也可能会损失部份的视力,在医院中,他的主治医师说这是相当普遍的意外事件, ”水绝对不能在微波炉中单独加热”,如果要用这种方法加热水,杯子里应该放些东西,例如:木制的搅伴棒或茶包等的东西,来帮助扩散能量,无论如何将水放在茶壶内烹煮会是较安全的加热方式。不只是水,纯液体都会突然滚沸。

视频: http://www.tudou.com/programs/view/BKEOf_JDRfY/

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暴沸,纯净的液体在内壁光滑的容器里面被加热到沸点以上的温度以后⋯⋯

以前在做实验的时候曾经发生过一次,真的是很危险啊!

实际上在在实验中加热高纯度液体的时候,都要在瓶里面放上几粒小瓷片来防止这种现象,但是在日常生活中好像这个办法不怎么实用,:(

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