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夏天,会看到小虫在水面上跳来跳去。这些小虫一般比水重,可是不会沉下去,水的表面好像有一层綳得紧紧的“橡皮膜”,支撑着小虫的躯体,还有,荷叶上的小水滴、草叶上的露珠,都是近于球形的……。这些都是水的表面张力的表现。水的表面张力,使水呈现出一种表面收缩的趋势。只要在水中加进一点东西,如能局部提高或降低表面张力就可以产生一些奇异的现象,下面我们介绍几个有趣的小实验。盘中盛纯净水,上面撒些碎纸屑。用筷子沾点肥皂液或用缝衣针
In the summer, you will see bugs jumping around on the water. These bugs are generally heavier than water, but they don’t sink. The surface of the water seems to have a tight “rubber film” that holds the bug’s body, as well as small droplets on the lotus leaf and grass blades. The dewdrops are nearly spherical... These are the manifestations of the surface tension of water. The surface tension of water makes the water show a tendency of surface shrinkage. As long as a little bit of water is added to the water, some strange phenomena can occur if the surface tension can be locally increased or decreased. Here are some interesting little experiments. Pure water in the dish, sprinkled with shredded paper. Use chopsticks to dilute soap or sewing needles