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一个偶尔的机会,我听了一堂自然课。老师让学生把蜡烛点燃,置于浮在水面的木板上,然后将一只玻璃杯罩在上面,不一会儿,蜡烛熄灭了,杯内的水面逐渐上升。学生对这个实验很感兴趣,对实验中发生的现象感到十分惊奇。这时,老师说:“杯内水面上升,是由于杯内空气减少造成的,对吗?”学生答道:“对”。老师又问:“那么杯内那部分空气到哪儿去了呢?”学生不知道是蜡烛燃
An occasional chance, I listened to a natural class. The teacher asked the students to light the candle, place it on a floating wooden plank and then cover a glass, and after a while the candle went out and the water in the cup gradually rose. Students are very interested in this experiment, the phenomenon occurred in the experiment was very surprised. At this moment, the teacher said: “The water level in the cup rises due to the decrease of air in the cup, right?” The student replied: “Right.” The teacher asked again: “Where did the air in the cup go?” Students did not know that the candle was burning