实验名称:铁环穿球
实验原理:固体的热胀冷缩
实验目的:
1.通过回忆上节课气体和液体的热胀冷缩,让学生学会类推法,推出固体也有热胀冷缩的现象
2.了解生活中热胀冷缩的现象,并学会用上节所学原因(微粒的运动)来解释
3.自己反复动手操作铁环穿球实验,体会和理解热胀冷缩现象
4.上节所学水有“热缩冷涨”的反常膨胀,固体也有反常膨胀现象,让学生体会科学的普遍性和特殊性。
实验过程:
1.温故知新,回忆并提问上节所学气体、液体的热胀冷缩,并用原理解释生活中的现象。
2.用故事引入新课,引发学生思考:为什么铁轨是一段一段的且有缝隙
![](https://img.haomeiwen.com/i6809678/d1a68dde8d8ead47.jpg)
3.动手操作实验,注意实验安全,多次操作体会。
![](https://img.haomeiwen.com/i6809678/185acc9f30cfa37b.jpg)
![](https://img.haomeiwen.com/i6809678/7b58e18698f7d9e4.jpg)
![](https://img.haomeiwen.com/i6809678/5bd4706010946ed3.jpg)
![](https://img.haomeiwen.com/i6809678/fd063b14122e2cb5.jpg)
![](https://img.haomeiwen.com/i6809678/e63c5b543191bcb8.jpg)
![](https://img.haomeiwen.com/i6809678/e4f84b6811618221.jpg)
![](https://img.haomeiwen.com/i6809678/a29f4c0b86b0295c.jpg)
![](https://img.haomeiwen.com/i6809678/66c86a26e22d60b4.jpg)
![](https://img.haomeiwen.com/i6809678/0ab76d5b0b9a394a.jpg)
![](https://img.haomeiwen.com/i6809678/1b283b1a101b6cdd.jpg)
![](https://img.haomeiwen.com/i6809678/43c7a50e64165acc.jpg)
![](https://img.haomeiwen.com/i6809678/340f3889305b1c24.jpg)
![](https://img.haomeiwen.com/i6809678/af994fff98a82d7a.jpg)
![](https://img.haomeiwen.com/i6809678/de2d7dcf2b55e7fe.jpg)
![](https://img.haomeiwen.com/i6809678/6ae83d3eb8d3f20d.jpg)
![](https://img.haomeiwen.com/i6809678/07b593d34cad6879.jpg)
![](https://img.haomeiwen.com/i6809678/a2c58ad6f8cb7b98.jpg)
![](https://img.haomeiwen.com/i6809678/37651b62cc221f01.jpg)
![](https://img.haomeiwen.com/i6809678/1ea30837f9175329.jpg)
![](https://img.haomeiwen.com/i6809678/1ad3e4c9dbd6e996.jpg)
![](https://img.haomeiwen.com/i6809678/8c6e8c96f44dc81b.jpg)
![](https://img.haomeiwen.com/i6809678/a8bd97b9c4167c8c.jpg)
![](https://img.haomeiwen.com/i6809678/e588633a6afe3ce4.jpg)
![](https://img.haomeiwen.com/i6809678/e4b2005ccfbe3793.jpg)
![](https://img.haomeiwen.com/i6809678/a494ee10d7d4a607.jpg)
![](https://img.haomeiwen.com/i6809678/126a5f279141f3af.jpg)
4.学生交流实验现象,总结原理,老师强调补充。
5.老师补充固体的“反常膨胀”。
实验总结:
气体、液体、固体的热胀冷缩现象是生活中的常见现象,让孩子在科学小实验的“玩”中去理解体会,比口头讲解要深刻的多,每一次的实验,从按照要求组装,到自己动手操作,再到描述现象,解释原因,孩子们越来越棒啦!!
![](https://img.haomeiwen.com/i6809678/9472989d9908729c.jpg)
![](https://img.haomeiwen.com/i6809678/4d0ba4ab29f5709d.jpg)
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