搜索 - 科创

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还原用的铁粉，原理是铁与酸反应产生的亚铁离子和新生态氢还原硝基，产物为四氧化三铁。因为产物和中间产物都有较高的毒性，因此全程在通风环境，并佩戴过滤式防毒口罩和护目镜。

然后用烙铁调好温度，将连接线用烙铁烙上去！（小技巧：一般烙铁可以通过调节烙铁头的长度来粗略的调节温度，通过剪下了的连接线来试验温度是否合适！）用这种方式检验连接是否良好！

交变磁场致悬浮看到磁悬浮地球仪的原理，我把一个铁盆放在电磁炉上悬空，距离电磁炉面板约2mm,开启电磁炉，铁盆有向上的趋势，或者说产生了悬浮力，可能是电磁炉的频率太高，效应不明显，磁悬浮地球仪的好像是100Hz

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