He took a paper clip and waved his hands over the cup. Then he took a breath of "Fairy Spirit" into the cup. At this time, the students stared at him. He put a paper clip gently into the water. The water in the cup was my nephew's Lantern - or my uncle's lantern. It just vibrated a little. The water didn't overflow. There was a warm applause immediately.
Is teacher he really magical? At this time, a classmate suggested: 'Mr. He, put some more paper clips in, and the water will overflow. "Teacher he listened and put in ten paper clips according to the previous method, but the water in the cup still hasn't" movement ", and students are dubious about whether teacher he has magic power or not.
Did he do something? So a classmate asked to operate on the stage. But he said mysteriously: 'since I want to let students operate on the stage, I have to teach some magic to the students on the stage. 'Mr. He's words make our second monk in law confused. Is teacher he really magical? At this time, Wang SHIMENG came to the stage. Teacher he called Wang SHIMENG to hold her fists with both hands. She then wrapped her hands around Wang SHIMENG's fists and blew them with her mouth. The simple ceremony of "teaching demons" ended. Teacher he asked Wang SHIMENG to throw paper clips into the water constantly. The students counted the same number: '1, 2, 3, 4, 5, 6 & hellip; & hellip; 67, 68, 69, 70 '70 paper clips are all thrown into the water. The water on the surface of the cup is like a child who has eaten a full meal, but it doesn't overflow. We are convinced one by one that he has magic.
At this time, Mr. He revealed the mystery to us. She said: 'water is composed of many water molecules. The water molecules on the surface of water close together and have a force of mutual attraction, which is the surface tension of water. This force shrinks the surface area of the liquid, allowing the water at the mouth of the cup to float on the surface without spilling. In our real life, because of the existence of this & lsquo; liquid surface tension & rsquo;, some small insects can walk freely on the water surface, and the dew on the grass, the water on the lotus leaf and the rain on the flowers will not fall down easily. "Ah, there are so many scientific reasons in this small experiment.