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当水沸腾时,你可看到“汽泡”翻滚,“白气”上冲.伫立于沸腾的水之前,你是否凝神遐思过下面所列见惯不惊的疑问呢?是否做过下列的实验呢? 水为什么会沸腾?你可不假思索地立即回答:是加热的原因吧.这是不确切的回答.接近沸点的烫水,不加热也会沸腾.不信,你可做做下面的实验. [实验1]如图1所示,烧瓶中的烫水,温度略低于沸点.将大注射器活塞向外拉.这时你可看到烧瓶中的水产生气泡呈现沸腾现象.
When the water boils, you can see the “bubble” tumbling and the “white gas” rushing. Before standing in the boiling water, have you ever confounded the doubts listed below? Have you ever done the following? Experiments Why does water boil? You can immediately answer without thinking: It is the reason for heating. This is an inexact answer. Hot water close to the boiling point will boil without heating. Do not believe, you can do the following experiment. [Experiment 1] As shown in Fig. 1, the boiling water in the flask is slightly lower than the boiling point. Pull the large syringe plunger outward. At this time, you can see the boiling water in the flask boiling.