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如何判断水烧开了
更新时间: 2020-09-24 00:00:00  

煮水将近沸腾时,常发出嘶嘶的鸣声。这是由于接触煲底的水先受热,当底层的水温度升至100摄氏度时,就首先变成水蒸气向上升。这时上层的水温度仍不足100摄氏度,当蒸汽的小气泡升至低于100摄氏度的水层时,就迅速变回水滴。这种先膨胀又再收缩的过程,就引起水的振动。当大量的小气泡从煲底上升时,就发出嘶嘶的鸣声。

关键词: 如何 判断

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