二年级科学上册2.4《神奇的纸》课件教科版.ppt

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神奇的纸,聚焦知识点,普通的纸有什么特点?我们能让它有更多神奇的本领吗?,防感冒纸,发光纸,石头纸,去污纸,隔热纸,隔热纸:03毫米厚的隔热纸糊在墙板上,保温效果相当于27毫米厚的砖墙。,去污纸:当衣物被弄脏,一时来不及清洗时,可以按衣服脏的面积贴上相应的去污纸,一会儿就可去掉脏痕,用起来十分方便。,防感冒纸:这种纸为三层,中间一层带柠檬酸和苹果酸,约6cm大小的这种纸,在不到1分钟内即可杀死上千个引起感冒的病毒。,石头纸:玄武岩用两千多摄氏度的高温溶解,制成了石头纸。这种纸不怕水,不怕火,可折叠,还耐磨,被尊为现代“最佳纸张”。,发光纸:它能在漆黑的夜晚发出亮光。使用这种纸,即使没有灯光,也能清楚地看见纸上的文字或图画。,探索,一、按一按,二、放一放,三、摸一摸,研讨一,折叠前后,纸有什么变化?,研讨二,下面的物品为什么要用瓦楞状的纸?,欣赏瓦楞状纸作品,拓展,在一张纸上刷食用油,再往纸上滴水,观察现象。,

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