"Everyone should sit down first. This multifunctional biochemistry laboratory will be open for everyone to use in their spare time. However, there are no experimental equipment here yet, so I will wait for a while before talking about it. Let me explain to you the principle of combustion first."

After leading the students into a bungalow that looked like the Hope Primary School in the countryside, Dang Maiguo arranged the students' seats and stood on the front podium and teacher's laboratory table to teach. As he said, there was no equipment in this classroom, whether it was a microscope and dissection instrument commonly used in biology, or a glass experimental instrument commonly used in chemistry.

Glass was called "glass". Although China's technology to make glass at the end of the Han Dynasty was quite good, glazing was produced as a kind of artificial gem, even glass shipped from the West. Although this kind of glass is gorgeous and beautiful, it does not meet the requirements of the Party's patriotism at all. What the Party needs is colorless glass that is more transparent and has better performance than glass shipped from the West at this time.

This colorless glass was successfully manufactured in China as early as 1000 BC, but it has never had a market. As gemstone, its quality is not as good as crystal. As window glass...one is because the technology at that time could not make such a large flat glass, and two is because even the most powerful guy at that time did not expect to make windows with gems, so they did not think about using small pieces of glass to piece windows.

However, at the request of the Party Patriotic, the glass workshop has now begun to increase research on colorless transparent glass, and has found ways to absorb the manufacturing technology of Western glass that has done better in this regard. However, the specific research on Party Patriotic is really not helpful. He actually has little knowledge of chemical knowledge, so he knows that the main component of glass is silica. Not to mention modern times, even the chemical formulas and chemical reaction equations used to make glass raw materials in ancient times, he was still disgusted.

Therefore, he can only provide scientific methods, ideas and a large amount of research funds, and ensure the research enthusiasm of glass craftsmen from a system. In addition, the only manufacturing process he can provide is that it is necessary to constantly stir and eliminate bubbles during the manufacturing process. But even if he provides this process, Dang Patriotic did not expect to see truly qualified optical glass within a hundred years. It would be great that they could produce ordinary glass in large quantities.

I'm a transparent split line

On the stage, Dang Maiguo clearly explained that the essence of combustion is that two combustible substances are mixed together to cause a violent chemical reaction, but it is just that. He did not use experimental evidence or further explain the specific principles of combustion, but simply explained it, and then called Jian Shuo and Bi Lan out to call someone to get the things.

"When I was doing the demonstration experiment later, as soon as I told everyone to 'be careful', everyone should immediately cover their ears and open their mouths. Remember! Now all the students in the front four rows stand up and then insert them between the students behind."

Dang Maiguo took advantage of the school workers to get the props for demonstration experiments, and inexplicably reminded the students, and then issued an inexplicable order. Except for Diao Chan, Cai Yan and Wang Can, other students did not know what he was selling. Even Da Qiao and Xiao Qiao would not always stick to the party and patriotism like other followers, so they naturally didn't understand why - they were not people from the party and patriotism...

Because the students were ready early, after they vacancies out the four rows of seats in the front of the laboratory classroom, the school workers came in with experimental supplies when it was still noisy behind the classroom. The students didn't pay much attention to other things, and their eyes were attracted by two long wooden boards that looked like door panels.

The two wooden boards were carried by the school workers and crossed the experiment bench in the first row. Then the school workers with big buns on their ears sat in the first row and supported the wooden boards diagonally, hudging their bodies completely behind the wooden boards, just like soldiers using huge shields to block arrows.

Behind a laboratory bench that was released separately for the four girls in the fourth row, Da Qiao quietly asked Diao Chan: "Sister Diao Chan, what kind of experiment is Principal Dang doing?"

I don’t know when these beautiful girls will be able to be called sisters. Anyway, Diao Chan also quietly reminded the Erqiao sisters, “You will know in a while. Remember, both sisters, you must cover your ears and open your mouth later.”

Da Qiao and Xiao Qiao were about to ask, and the Party Aiguo on the podium began to explain again: "I have said just now that most combustion phenomena are violent chemical reactions between combustible objects and oxygen in the air. In this violent chemical reaction, a large amount of light and heat will be emitted and new substances will be generated. If this reaction proceeds very quickly, and the volume of the substance generated after the reaction expands sharply and is confined to a small space, an explosion will occur."

He said this, and his hands kept slapping the frame of the flour sieve made of bamboo strips, so that the flour that had been ground in the sieve that had been particularly finely ground fell down like fine snow powder. Under the flour sieve, there was a large cylindrical paper tube framed the flour, but even so, the dust in the paper tube gradually rose up and was about to run outside the paper tube with the air.

Dang Maiguo was very focused on sifting flour, not knowing whether he was planning to make cakes or some pasta. He quickly signaled Jian Shuo, who was pouring flour for him, to retreat, and then ordered the school workers guarding the window: "The school workers by the window, open all the windows."

These school workers had been reminded to open the window quickly at this time, but they had not caused any wind to open the window at the same time. Then they all retreated to the fourth row and covered their ears early, with some fear on their faces for some reason.

After sifting the flour carefully for a while, Dang Maiguo turned to the door and shouted, "Put in the dark fire!"

Then he turned to the students and shouted, "Be careful, cover your ears!"

At this time, from outside the open door, a school worker had something in his arms, ran to Dang Aiguo not far from where he put things, and immediately turned around and rushed out of the classroom door as quickly as possible. Dang Aiguo did not take it as an offense, and threw the flour sieve on the flour bag below the experiment table, quickly picked up the "hidden fire", pulled out the paper hat on it, and immediately poked it into the flour in the cylinder.

The so-called dark fire is a useless thing that the Party has temporarily invented. It is to wrap a thick piece of paper on a column of incense for timing, then ignite the incense, and then put a thick paper hat on it. Because it is just a thick paper hat, it will be lit for more than twenty seconds after being baked by incense, which is far worse than a fire note.

But things are not good or bad, just enough. As soon as the incense in the hands of the Party Patriotic Kingdom was inserted into the dust-filled cylinder, a loud "bang" sound came immediately. The round paper tube and the flour inside exploded, swallowing the Party Patriotic Kingdom into a ball of white smoke.

The students standing behind the fourth row covered their ears with their hands and saw a bright flame emitted from the paper tube, and then a wave of flour gushed out, impacting the inclined wooden boards in the first row, turning diagonally upwards to impact the low ceiling, and then fell down like snowflakes. There were also burning pieces of paper that were falling down in a swaying manner.

Those students who strictly followed the instructions of the Party and the patriotism were not hurt except for feeling some heat mixed with the smell of roasted flour and the sound of shocking, but were just startled. However, their ears were not covered so tightly. They also considered that the students who did not open their mouths were all shocked and could not hear any sound for a moment.

In this deterrent scene, Dang Maiguo, whose figure was obscured by dust, was carrying a bag of flour sieve and leftover flour in one hand, and holding a portion of the incense that had been blown away in the other hand. He walked from behind the laboratory bench to the door and shouted to the outside of the door: "Get in and fan the air and clean the classroom!"

After calling out to the people, Dang Magistrate Reich back from the front door and walked to the back spotlessly among the flour falling like snowflakes. Only then did the students see that whenever the flour fell on him, it would automatically slide to the ground. His strange black (actually, naughty blue) clothes seemed to be slipperyer than the ice surface.

The students' eyes were involuntarily focused on the Party Aiguo who seemed to have come out of the wind and snow. At this time, the back door of the classroom was opened, and seven or eight strong school workers holding large fans that could be used to fan the elephants, suffocating forcefully as they walked from the last row. The wind they fanned out and the cold early spring wind that poured in from the open windows continued to circulate, making these students who were not very thin dressed couldn't help but tremble.

After the dust in the room was blown out and the air became fresh again, more than a dozen school workers came in from the front door and quickly cleaned the front of the classroom full of flour. Dang Aiguo walked to the students behind the fourth row at this time, and looked at the stunned students and said with a smile: "How is it, are you shocked? Just now I just spread the flour fully in the air in the cylinder. A large amount of gas produced when the flour and oxygen burned violently expanded, which caused an explosion."

At this time, the students who were still ringing in their ears just looked at his mouth moving in dismay, with an expression of "What did you say? I can't hear it". Dang Paiguo laughed in his heart. The voice was indeed very loud just now, but it would not cause permanent damage to their eardrums. It just gave these students who were not very concerned about his words.

Compared with Dang Aiguo's first experiment, the flour sieve he used was much smaller. At that time, Diao Chan and others who were waiting outside the laboratory saw some white air waves spewing out from the front door and the two open windows of the classroom, and the sounds coming from inside were like thunder.

ps: I wish you a happy Lantern Festival. In addition, there are 3,000 recommended votes for 12 noon today, which is convenient for where to get together in the afternoon and evening.
Chapter completed!