Time flies three days, and there are only two days left before the Mid-Autumn Festival.

Chen Xu also arranged the perfume production one after another. Not only did he arrange people to continue picking and collecting a large number of osmanthus, chrysanthemums and various herbs, so that a group of alchemists in the chemical laboratory could distillate and refine them day and night, but he also arranged for the glass factory to start producing and producing larger distillation equipment and making crystal glass bottles of different colors. The brand pattern labels and product instructions of the flower fairy designed by water were sent to the printing factory for printing, and the outer packaging box was also commissioned to a wooden workshop to start production and production.

Chen Xu, the most complex press-type spray cover, went to the Institute of Technology to convene some students and craftsmen to give a lesson, explaining the working principle, preparing to let these students and craftsmen start public relations research, and also offered a huge reward of 5,000 yuan to stimulate the enthusiasm of all students and craftsmen.

The principle of the pressing cap is very simple. It is actually a simple air pressure pump. Chen Xu was curious before and even opened the shampoo hand sanitizer spray cover. There is a coil spring in the sealed air pressure chamber as a restoration device. In fact, it is the same as the air pump and bellows. After pressing it, the gas in the air pressure chamber is emptied. Under different air pressures inside and outside, the liquid in the bottle is squeezed out along the conduit and sprayed out from the nozzle. After letting go, the spring bounces up, and the gas enters the air pressure chamber and the bottle, and the internal and external pressures reach equilibrium.

This principle seems very simple to Chen Xu, but when he was explaining, he found that everyone was listening to a heavenly book, with his eyes wide open and his mouth wide, looking at him in amazement like a group of husky.

Air pressure is not a new term for these people. Chen Xu mentioned it many times when he first explained the terrain and climate. It is precisely because of the different air pressures in different regions that wind flows, resulting in various different climates such as rainfall, snowfall, and even drought.

But after all, this is a very abstract statement. Everyone does not understand what the real air pressure is, because air pressure cannot be seen at all, so it cannot describe its specific existence and its role in real life.

The idea that by squeezing out gas can pull water out of the bottle will definitely not succeed in everyone's opinion.

"Marty, how can the air pressure you mentioned prove its existence? You have also said that the air we live in is full of various gases, and we rely on oxygen to breathe, but since ancient times, we have believed that breathing is nature. Zhuangzi said: "Brave breathing, exhaling old and accepting new things, and it is just a long time! Breathing is just the body that vomits old and accepting new things, not to breathe any oxygen from the air. Moreover, the air is empty and empty, so how can we get the air? Once the air is exhaled out of the body, it will disappear in an instant..." A craftsman with a tummy stood up to refute Chen Xu.

In the Academy of Sciences system, everyone knows that when discussing problems, they can speak freely, and whether they are right or not, they can raise questions and discuss them. However, they must have their own ideas and cannot refute others for granted, that is, they cannot be pure trolls or gangsters.

"Yes, the first childbirth of a person is still within the mother's womb, and he has no breathing but can still develop and grow. Where does the oxygen that the marquis say come from..." Another Motu student with a fairy spirit stood up and echoed.

"In the mother's womb, of course, people receive the mother's oxygen through the umbilical cord..."

Chen Xu was interrupted before he could finish his words.

"Mr. Marquis, the baby is pregnant in the mother's fetus. He has no breathing because he has fetal breathing. The umbilical cord is only powered by the mother's blood..."

"That's right, the reason why the fetus survives is because the innate ancestral energy stored in the mother's body is called innate vital energy. The fetus obtains innate vital energy through fetal breathing to grow. Once the acupoints open after the baby is born, it can breathe and breathe..."

"Yes, yes, what the Marquis said is rootless and unreasonable, and it is not scientific at all, and it is really hard to agree with..."

Chen Xu:...

I'm so unscientific, a group of stupid fools who don't understand. What I'm talking about is science, okay, you group of stubborn people in the way of heaven.

Chen Xu found that a group of people in the Academy of Sciences system are becoming increasingly difficult to fool. In the past, these people believed in whatever they said, and listened with relish. However, since the scientific skepticism began to become popular, Chen Xu felt that every time he said some new theories, he would always be suspected. If he could not show the proverb method of seeing it, these people would be very excited.

Moreover, Chen Xu was also very depressed. It was indeed very brain-consuming to talk about science with a group of people who believed in metaphysics, because they always easily link the Yin and Yang Five Elements and the Zhouyi Eight Trigrams to explain natural phenomena.

"Baopaopaopaopaopaopaopaopao" Chen Xu knocked the blackboard a few times with the teaching stick, and his black-skinned eyes were almost gone. "Don't you believe in the existence of air pressure?"

"If you don't believe it, unless the Marquis can prove it to us?" Almost everyone in the classroom shook their heads together.

Chen Xu thrust his face a few times, then looked at the ceiling of the classroom forty-five degrees for a long time and nodded and said, "Okay, I will prove to you today that the air pressure will show you the existence of air pressure. The power of air pressure can not only pump water, but also open your eyes. Go and find a curved water pipe..." Chen Xu pointed to a teacher sitting in the front row.

"Mr., how thick and how long should it be?" The teacher stood up quickly.

"A half an inch in diameter is enough, it's only a few feet long, but it must be curved!" Chen Xu said, pointing to the two students and said, "You two go and carry a bucket of water and an empty wooden barrel!"

Chen Xu quickly prepared all the things he wanted. The bucket filled with water was placed on the podium. The empty bucket was placed on a stool a little lowered. A curved tube was also found. Chen Xu gestured for a moment and felt that he could roughly pull out the water.

"If I could transfer the water in the bucket into the empty bucket by relying on the pipe in my hand without using any other items, you must not believe it, right?" Chen Xu showed it to everyone in the classroom with the pipe.

Many people looked at each other and nodded together.

Although many people have seen tap water towers, the water tower drains water from the bottom, but Chen Xu currently only has a thin tube. Judging from experience, it is impossible to discharge the water from the wooden barrel into the empty barrel.

"Please keep your eyes wide open. Here is the moment to witness miracles..."

Chen Xu put one end of the water pipe in a wooden bucket and was about to hold the pipe and suck out the water. However, he looked at the dirty thing on the pipe head, and didn't know what it was, so he smiled and pointed at the first guy who questioned him and said, "Come here to cooperate with the experiment, and inhale hard at the mouth of the pipe. Remember, you can't leak your mouth!"

"Yes, Marquis!" The guy ran up with excitement and blushed. He took a breath without even looking at it. Then a stream of water rushed into his mouth and tears fell down.

Just as the craftsman loosened the pipe, in front of everyone, he saw a stream of water flowing out of the pipe, falling into the empty bucket.

"Wow~~" There was a commotion in the classroom, and almost everyone rubbed their eyes and thought they were dazzled. After a moment, the classroom began to make excitement and noise. Many people even left their seats and ran to the podium to watch. Chen Xu did not stop him and enthusiastically greeted everyone to come up and observe.

"Marty, this... Could it be that you used the immortal magic?" A group of people stared at the flowing water pipes, and one of the craftsmen said excitedly with a slight swaying.

"It's not a magic spell, but this marquis uses scientific principles!" Chen Xu curled his lips.

"But we have never seen such a strange thing before, and water can actually run from one bucket to another by itself!"

"Hey, how can this water flow upward..."

"Yes, this is so strange, incredible..."

"Who said no, I feel like there is a ghost in this tube..."

"Ghost, uncle!" Chen Xu kicked the craftsman who said there was a ghost on the butt, and then drove a group of guys back to his seat and said, "This is a simple physical phenomenon called the siphon principle..."

"Mr. Marquis, what is the principle of siphon?" a craftsman asked loudly.

"Rainbow, it's neon. You should have seen neon. After a summer rain, you can see a colorful halo in the sky. You see, the tube in my hand is also curved. Therefore, I called the method of transferring water from one bucket to another. This is a universal principle that is universal. As long as one water surface is higher than another, the water will continue to surge to the high place and flow to the low place until the water level on both sides is as high as the last. If the water level is high enough and the pipe is long enough, the water at the high place can finally be drained. The key to maintaining this siphon principle is because of the dual effects of air pressure and water pressure!"

"Mr. Marquis, you have talked about water pressure and air pressure before. What you said is not that we don't believe it, but even if you did this siphon principle experiment, where is the air pressure you said?" A craftsman stood up and questioned again.

The so-called hearing is false and seeing is true. But now, even if they really see Chen Xu pulling water from one bucket with just a curved tube, they have to further question it because the thing of gas is invisible and intangible, and it is essentially different from water, so they cannot completely resolve the doubts, and even more doubts arise.

"I have said before that air is everywhere. Although it is invisible and intangible, it does exist. There is gas in the water pipe just now, so after putting the water pipe into the water, the water cannot come out of the water pipe because of the balance of air pressure. However, after I asked someone to absorb the air in the water pipe, there was no air in the water pipe. Under the pressure of the air outside, the water enters the water pipe..."

"Mr. Marquis, just now the water came out of the water pipe was not because of the air pressure, but because Fang Da's ear sucked the water out of the wooden barrel! Another craftsman stood up and said loudly.

"Yes, yes, the more you talk, the more complicated it becomes, and it is obvious that Dajiang Fang sucked out the water with his mouth."

"Of course!"

Looking at the doubts in the classroom, Chen Xu was so angry that he was itchy. Damn it, I shouldn't have been promoting anything.
Chapter completed!