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人教版义务教育教科书物理八年级上册,“科学之旅”序言中,“有趣有用的物理”这一内容的第一个演示实验是:水沸腾后把烧瓶从火焰上拿开,水会停止沸腾.迅速塞上瓶塞,把烧瓶倒置并向瓶底浇冷水,停止沸腾的水,浇上冷水后会怎样?虽然从实验中可以观察到停止沸腾的水会重新沸腾的现象,但是实验中有不足之处:当烧瓶倒置并向瓶底浇冷水时,由于瓶塞不容易塞紧,而烧瓶内水
The first demonstration experiment of the content of the textbook “Pleasant and Useful Physics” in the eighth edition of Physical Education Textbook for Compulsory Education of the People’s Republic of China and the prelude to the “Scientific Journey” is: After the water boils, the flask is removed from the flame. The water will stop boiling, quickly plug the bottle stopper, turn the flask upside down and put cold water on the bottom of the bottle, stop the boiling water, what will happen after pouring cold water? Although the phenomenon that the boiling water stops boiling will be observed in the experiment, However, there are deficiencies in the experiment: When the flask is upside down and poured cold water on the bottom of the bottle, because the stopper is not easy to plug, the water in the flask