著名教育学家约翰·杜威说过:游戏是儿童的天性。孩子们用善于发现的眼睛打开神奇的科学世界,他们在各种各样的科学游戏中积极思考,勇于尝试,不断探索,感受着科学游戏带来的无限魅力。
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今天让我们和大二班小朋友一起走进探索之旅吧!
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我们需要的实验道具:两个盛水的盆(一个盛热水、一个盛冷水)、气球、矿泉水瓶。
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小气球在热水里会吹起来呢?还是冷水里呢?
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知识小课堂:矿泉水瓶中空气遇热膨胀上升吹起小气球🎈,当把它放入冷水中时,空气开始收缩,气球中空气越来越少,小气球瘪了。
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小朋友们一起来试一试吧!
哇~我的气球鼓起来了,好神奇,这是什么原理呢?哦…原来是热胀冷缩的原理!
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00:15
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01:32
在我们生活当中还有没有这样的例子呢?
1、把煮熟的鸡蛋放在冷水中浸一浸,蛋就很容易剥开,这是因为蛋壳和蛋白的收缩程度不一样的结果。
2、夏天自行车打气不能打太足。
因为气体受热膨胀,如果太足,会涨破车胎。
3、把拧不下的金属瓶盖放在热水里浸一
会,瓶盖就很容易拧开了。
这是因为瓶盖受热后与瓶口缝隙增大。
4、踩扁的乒乓拿热水烫烫就鼓起来了。
这是因为乒乓球里面的气体受热体积增
大。
5、温度计。
制作原理:液体的热胀冷缩。
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孩子们,只要你平时仔细观察,你一定会发现好多好玩的事情呢!
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