Bottle swallowing eggs

　"Dingell ......", Mr. Liu stepped into the classroom with a brisk bell and a breezy face. Look, Ms. Liu's composition class is charming! Every time it brings us a different surprise, the students who usually hear the bell and enter the class one after another, in twos and threes, are already sitting in their seats and waiting for it.

　　Liu, with a smile on her face, loudly announced, "Today's composition class will do a science experiment." This is really "a stone stirred up a thousand waves", the classroom was silent and suddenly agitated, we can not suppress the excitement inside, some crossed their ears, whispering, some raised their hands and cheered, and some stood up to look at the neck, my heart only muttered, Ms. Liu will do science experiments? This is a dice roll of seven points - unexpectedly ah!

　　Ms. Liu then asked everyone: "Who can guess what items can also "eat" eggs?" The words just fell, and everyone scrambled to guess, I was a bit confused, items can also eat eggs. Mr. Liu smiled mysteriously: "I'll let the bottle "eat" an egg today!" The classroom exploded again. Ms. Liu made a quiet gesture, and without panic, like a trick, brought out a thin glass bottle and a peeled hard-boiled egg. I couldn't help but suck in a breath of cold air, looking at the mouth of the glass bottle, which is much smaller than the egg, no way. Such a small bottle mouth can swallow the egg? Could it be that Mr. Liu is a relative of Liu Qian and can do magic?

　　"Who will come to witness the miracle with me?" Mr. Liu's words interrupted. My contemplation. "I'll do it!" Liu Jingyang couldn't wait to raise his hand, and without waiting for the teacher to finish, he jumped onto the podium with great strides. Mr. Liu asked Liu Jingyang to put the egg directly into the mouth of the bottle, and the egg ended up sticking to the mouth of the bottle like a fat uncle. After half a day's effort, the mouth of the bottle still could not swallow the egg. When the students saw this, they started to make suggestions for him, but as a result, it didn't help. At this point, Mr. Liu asked Liu Jingyang to pour hot water into the bottle and then pour it out, and then immediately put the shelled egg in the bottle. As expected, a miracle happened, the egg was like eating a fast-acting diet pill, slowly becoming long and thin, and the egg white below slowly leaked a light yellow, like a baby chicken just showing its head from its mother's belly, and was about to be "born"! Watching the egg yolk keep falling, everyone held their breath, eyes glazed over as if in a blink of an eye, the egg will turn into a chicken fly away, I nervously rubbed my eyes, followed by everyone's countdown: "ten, nine, eight, seven, six ......" The egg yolk was finally "born" and fell into the bottle below, and the egg white lay helplessly at the mouth of the bottle, shaking its tired body with relief.

　　Yay! The classroom was abuzz, an ordinary bottle swallowed an egg larger than the mouth of the bottle in full view of everyone, which was amazing and unbelievable.

　　Finally, the teacher told us that the experiment of the bottle "swallowing" the egg was the result of atmospheric pressure and that the hot air inside the bottle consumed the oxygen inside the bottle, making the air pressure inside the bottle lower than the outside air pressure, so the egg was "swallowed" by the glass bottle. This experiment gave us a more concrete image of the concept of atmospheric pressure. It was a very interesting and insightful lesson.