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小学三年级自然课:液体的热胀冷缩教学过程: “水,我们天天喝,天天用,可一些性质仍没注意到。不信,请看实验。”富有教学经验的罗老师用装满红色水连着玻璃管的烧瓶做实验。“把烧瓶放在热水里会出现什么现象?”老师问。“烧瓶会变热。”“里面的水也会变热。”学生答。“那我们试一试。”老师说。一试,试出了“怪”。学生们兴奋地嚷:“水会顺着玻璃管往上跑!”“这说明了什么?”老师问。“水增加了。”学生答。“是不是你们加进了水?”“没有啊。”“那水怎么往上升了?”学生们张着嘴答不出。“给你们5分钟,小组讨论一下。” 5分钟以后,老师问:“明白了
Primary third grade natural class: liquid thermal expansion and contraction teaching process: “water, we drink every day, every day, but some of the properties still did not notice .Do not believe, see the experiment.” Rich teaching experience with teacher filled with red Water attached to the glass tube flask experiments. “What happens to the flask in hot water?” The teacher asked. “The flask will get hot.” “The water inside will also get hot,” the student replied. “Let's try it,” said the teacher. A try, try out the “strange.” The students shouted excitedly: “The water runs down the glass tube!” “What does this mean?” The teacher asked. “The water has increased,” the student replied. “Did you add water?” “No ah.” “How did that water go up?” The students could not answer. “Give you five minutes, the group to discuss.” 5 minutes later, the teacher asked: "understand