First, my father found an egg and a bottle smaller than the egg. Then, my father heated the bottle with hot water, put the eggs on the bottle mouth, and I poured some cold water along the bottle. An interesting thing happened. Eggs actually slide slowly from the bottle mouth to the bottom of the bottle. I shouted in surprise: "Mom, come and see, the egg slipped in!" " "Hearing this, my mother rushed over and said with surprise," Wow, really! " "

Dad turned the bottle upside down again, and when the egg slipped to the mouth of the bottle, it got stuck at once. I shouted anxiously, "Dad, what should I do?" Eggs can't get out! " Dad smiled. He poured some hot water on the bottle, and the egg finally slipped out of the bottle.

I looked at it and asked curiously, "Dad, why is the egg so big that it can slip out of a smaller bottle?" Dad smiled and said, "Good question. Let me tell you something. This is because after the bottle is heated, the air inside will expand like a big fat man. After pouring cold water, the air inside will become cold and shrink, just like a person who hasn't eaten for a few days, and suddenly he will be hungry. " The air outside can easily push the eggs in. When the bottle was finally heated, the air in the bottle was like a fat and strong Hercules, and the eggs were pushed out at once. "

Today, we had a comprehensive practical lesson in our class.

After telling us some theoretical knowledge, the teacher said to us, "There are still more than ten minutes before class is over. Let's do an experiment, shall we? " We said loudly with one voice, "Good, great!"

The teacher asked a classmate to bring experimental instruments, two cups, a lighter and an alcohol lamp. After the utensils were brought, the teacher began to do the experiment. We all watched quietly. The name of this experiment is "the bottle eats the egg". Start doing experiments. The teacher praised the lighting of the alcohol lamp, then put a bottle on it and let the alcohol lamp burn to the bottom of the bottle. There is an egg on the bottle mouth. Because the bottle mouth is relatively small, the egg did not fall, but was placed on the bottle mouth. After a while, hot air came out of the bottle. After burning for a while, the heat disappeared. I think according to the book, this egg should have fallen into the bottle by now. However, the egg still lives motionless on the bottle mouth. It seems to be laughing at our inability to put it in a bottle. After cooking for a while, the egg still sits firmly on the bottle mouth. At this time, the teacher said, "It seems that the mouth of this bottle is too small, so the experiment was not successful." Now, let's change a bottle with a bigger mouth and do this experiment again. "We waited patiently. The teacher went to find a bottle that was bigger than the opening just now, and the egg wouldn't fall into it immediately.

Now I'm burning bottles with alcohol lamps. This time, it was great. Shortly after the bottle was heated, it seemed that the egg on the bottle mouth was no longer Jiang Taigong, but fell into the bottle. Ah, the experiment succeeded! The bottle really ate the egg! The teacher still wants us to discuss the reason, but the bell has finished. So, the teacher said, let's find a few people to discuss after class, and then communicate in the next class to find out why.

Today, the experiment of eating eggs in a bottle finally succeeded.