Why can’t balloons blow up? Essay about 350 people

On the eve of the "June 1" Festival, the students prepared many balloons to decorate the classroom. Balloons that were tied around the classroom and played with in the hands were once popular. The teacher also became interested and asked us to have a balloon blowing competition in an activity class.

Haha! This is too simple! Who doesn't know how to blow up a balloon? My little cousin who has not yet grown teeth and needs to be held by his mother all day long can also blow. What a piece of cake. I saw a long queue of applicants in front of the podium. The students did not use any force to blow the balloons, and the balloons were blown up. Some even blew the balloons too hard and burst them. The fun is yet to come. The teacher asked the students to put the balloons in the bottles and blow them up to see who could blow them bigger. The students in front of the podium were defeated one by one. The balloons were inflated like small lotus buds at most and could no longer be inflated.

Dai Xiongfeng, who was sitting in his seat, couldn't sit still. How could this famous strongman in the class help at this time? He ran up swaggeringly, looking confident. He seemed to be very experienced. He took a deep breath first, pointed his mouth at the mouth of the bottle, and blew hard. Once, twice, three times... Again, he put all his energy into feeding. You can see his cheeks puffed up, his eyes widened, his face swollen and red, and the balloon was still the size of a baby's bud. "Come on, come on!" The classmates next to him also cheered for him with red faces, but the balloon just didn't move. No matter how hard you tried, it didn't help. It was really puzzling. Why can't the balloon in the bottle be blown up?

Suddenly, I saw the balloon of He Danwu Ping, the "ghost elf" in my class, getting bigger in the bottle. Hey! The eyes of the whole class were focused on him. It turned out that he poked a hole in the bottle with an iron nail, and the balloon inside inflated, filling the entire bottle, and squeezed out a small air sac the size of a nipple through the hole. It was really interesting. Why can't a balloon blow up in a bottle without a hole? The "elf" said: "That's because the air in the bottle can't come out!" The secret was revealed. Today's balloon blowing champion is none other than him.

Through this activity, I understood that you need to use your brain when doing experiments. There are actually many little mysteries in life, just waiting for us to discover!