Today, the teacher did the test that floats on water of a small injection in the class!
今天，老师在班里做了一个轻针水上漂的实验！
Above all, the teacher took experimental tool, experimental tool has club of a basin of a towel of a piece of a clip, paper, transparent glass, glass and a clear water. The teacher puts the glass of replete clear water on the desktop. Take out a clip to be put on surface from clip box next, when clip firm lay a finger on sinks immediately to the clip when surface, then the teacher takes out towel of a piece of paper. Put paper towel gently on surface, write a composition like that hind the teacher puts clip cautiously on surface, strange is, clip did not sink, crossed paper towel a little while to had absorbed sufficient moisture, then the teacher is taking vitreous good seal towel of a few paper, paper towel sank but clip still still waves to go up in surface, classmates are extremely open-eyed, final teacher takes vitreous good seal a few clip, clip sank immediately. This is too magical also, teacher meeting blackart?
首先，老师把实验工具拿了出来，实验工具有一盒回形针、一张纸巾、一个透明玻璃盆、一根玻璃棒和一盆清水。老师把装满清水的玻璃放在桌面上。然后从回形针盒里拿出一根回形针放在水面上，当回形针刚触碰到水面时回形针就立马沉下去了，于是老师拿出一张纸巾。把纸巾轻轻地放在水面上，然后老师小心翼翼地把回形针放在水面上，奇怪的是，回形针并没有沉下去，过了一会儿纸巾已经吸足水分，于是老师拿着玻璃棒戳了几下纸巾，纸巾沉了下去但回形针还依然飘在水面上，同学们惊讶极了，最后老师拿玻璃棒戳了几下回形针，回形针就立马沉了下去。这也太神奇了，难道老师会魔法吗？
The teacher told everybody the principle later, the principle is so such: Meeting float is in clip on surface, because the surface of water has a Xiaoshui to drip,be, propped up clip hand in hand. This is exterior tension. The urine drop that the clip that is put on surface directly comes up against is too little, do not maintain clip, because this clip is met,sink immediately. And the clip that filled up bumf, can very flat is put on surface, because drop of a lot of urine can maintain it together, accordingly, clip won't sink benthic.
后来老师把原理告诉了大家，原理原来是这样的：回形针会浮在水面上，是因为水的表面有一层小水滴，手拉手撑住了回形针。这就是表面张力。直接放在水面上的回形针碰到的小水滴太少，就撑不住回形针，因此回形针会立刻下沉。而垫了卫生纸的回形针，可以很平地放在水面上，因为有好多小水滴可以一起撑着它，因此，回形针就不会沉到水底。
A lot of water can be accumulated on coin, water chelonian can walk on water, also be the exterior tension because of water.
硬币上能积好多水，水龟能在水上行走，也是因为水的表面张力。
You try these experiments quickly also!
你们也快来试试这些实验吧！