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Atmospheric pressure to help - save "bad luck coins"

Atmospheric pressure to help - save the "unlucky coin" Fujian Fuzhou Drum Tower, Fengfengfang No. 42 College of Education, attached to the second class of the second class, Lin Biao, a coin is very "unlucky", was selected by a teacher named He Jie and composed in the composition class and Also demonstrate to do an experiment. Let's call it a "lucky coin." The "unlucky coin" was placed in an empty plate and then immersed in water. Teacher He asked the question: How can I “save” the coins from the plate without the hands being wet and the plates not moving? The answers of the students are very strange, such as: using chopsticks; using a water pump to drain the water; using a napkin to dry the water; some simply drying the water... saving the "unlucky coin", is this a common method? ? Look at the teacher. What is the most scientific way? Tonight, Teacher He, did this test. First, Mr. He prepared a cup, a piece of waste paper, and a lighter. He used a lighter to ignite the paper. When it was burning, put it in a glass. When it burned into a glass with only a few stars, quickly pour the glass with burnt paper balls. Buckle on that plate, ha, what happened below is interesting. This glass is like a water pump. All of a sudden, the water in the plate is like the steam being sucked up by the sun. It is sucked up by this "high efficiency" "pumper", and then the "unlucky coin" It was easily saved. Needless to say, there must be a scientific reason in the middle, that is: soon after the paper is burned and stuffed into the cup, the air in the cup will be almost consumed, the air pressure in the cup will drop, and the pressure outside the cup will be lower than the cup. The air pressure is high, so the water is squeezed into the cup by the high pressure outside the cup. If there is no water in the plate, the coins can be taken out naturally. The "unlucky coin" was "save" in this way! Comment: The little author uses a humorous language to present a small scientific experiment to the reader, making us happy when reading. In particular, the title also draws on the familiar movie titles, adding more vivid and interesting articles. Instructor: He Jie

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