带孩子做科学实验系列之 - 会跳舞的葡萄干
下面介绍的这个试验是会跳舞的葡萄干，试验步骤简单但却很有趣。
试验准备
这个试验需要以下这些材料：
葡萄干Raisins
柠檬水
玻璃杯
试验步骤
首先往玻璃杯中倒入柠檬水，注意一定要把瓶子斜着倒，这样能够最大程度的保持住泡沫，从而保证好的试验效果。其实就和倒啤酒一样。
接下来加一把葡萄干到杯中。
你就会看到葡萄干在”跳舞“了! 注意观察一下看看葡萄干是越跳越欢还是逐渐慢了下来？如果再多加点葡萄干会怎样？
其实这个实验的原理很简单：因为在柠檬水这样的饮料中有很多二氧化碳，在葡萄干刚刚放入杯中的时候，会沉到杯底。杯底的二氧化碳气泡会携带这葡萄干浮到杯子最上面。到了杯子上面的时候二氧化碳气泡会破裂，没有了这些气泡，葡萄干就会再次沉到杯子底部。
非常感谢阅读，欢迎Follow, resteem和upvote @aafeng 激励我创作更多更好的内容。
往期科学实验系列
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I enjoyed reading your post. There is a lot of good stuff.
Thanks
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感觉不错啊，来唬弄小孩子最好了