After Jia Xu answered the Party Patriotic answer, he seemed to have some intention of asking something. However, after thinking about it for a while, he finally respectfully bowed to the Party Patriotic, and then sat down again. The Party Patriotic sighed slightly in his heart. How did Jia Xu's character form, is he too cautious?

Students aged around 20 have confidence in affecting them through education. For example, middle-aged and young students over 25 years old, such as Liu Bei, Cao Cao, Yuan Shao, Lu Bu, Sun Jian, etc., Dang Patriotic was originally just planning to let them train at Central University for two years, and after having a clear and correct understanding of the scientific knowledge taught by Central University, they were enfeoffed to various places.

Children are the future of the motherland, so the party’s patriotism is basically all targeted by young people under the age of 25.

After answering the questions of Gan Ning and Jia Xu, although other students seemed to have some questions, Dang Aiguo looked at the time and pressed his hands down and said, "Okay, if you have any questions, please ask me later in the spare time, we will continue to carry out the next experiment."

Dang Paiguo raised his face to Jian Shuo and Bi Lan who were standing at the end. They both understood and ran out of the back door and called for someone to take experimental supplies. No wonder the emperor liked to use eunuchs so much. I have to say that eunuchs who could make a fortune would be comfortable to use them one by one. This is also a kind of survival of the fittest. The jungle rules in the palace are very cruel.

"What we just burned was flour, and its main components were carbohydrates. Combustion with oxygen will form carbon, carbon dioxide... and water. Among them, solid carbohydrates and oxygen combine to turn into gaseous carbon dioxide and water vapor, and the isolation between molecules has increased a lot."

While the school workers were picking up experimental supplies, Dang Aiguo began to explain the explosion reaction in detail. No matter how much the students could understand, they all stared at each other with their ears. If it were to talk about the principle first, they would probably have fallen asleep directly afterwards.

"A volume of solid has so many molecules in it. When they become gases after they are burned, a molecule will combine with oxygen to form several carbon dioxide and water molecules, which are all in the form of gases. You can see intuitively that this volume of solid instantly expands dozens or hundreds or even thousands of times. The original particles in the air are very uniformly distributed, and are squeezed hard by the sudden extra gas molecules and move quickly around. This is an explosion."

Dang Maiguo used a brush to draw simple illustrations on the "blackboard" made of white lime, explaining the principle of flour explosion easily and easily. Cai Yan and Wang Can below also use their pens to make class notes like enclaves. They are simply role models for those students who are eager to learn from later generations. In contrast, other students seem too leisurely, and even they themselves sometimes feel sorry for it.

"If the gas is not generated after combustion, the newly added gas can slowly squeeze the surrounding gas to the side, just like people pushing one outwards one by one, constantly making room for the people behind, and there will be no explosion. Only when a lot of gas appears in a very short time will the thrust be greater, just like a group of people suddenly squeeze out, which will naturally squeeze the people next to them to the ground.

So if we want to make the explosion more powerful, we need to find substances that can burn violently in a short period of time and the volume of the product will expand violently. The experiment I want to do below is experiments on mixing and burning several powders. These powders have been confirmed, namely charcoal, sulfur and saltpeter. For more knowledge, I will explain in the answer when you ask a question. Now we will wait for the experimental supplies to be delivered.

Also, I would like to warn you that this experiment is more dangerous than the experiment just now. If you want to do this experiment, you'd better come to this laboratory classroom or choose a house that is not prone to fire, and the amount of raw materials for the experiment must be small. The best way is that you don't do this experiment in person, but teach this knowledge to other people who specialize in this research, let them go to the experiment, and you will gain the experimental results in a safe place."

The Party and the Patriotic Republic seem to say casually, and vaguely pointed out the best way to use this knowledge to them. I don’t know how many people with intention can pay attention to it. However, even if they don’t pay attention now and send them class records after school tomorrow, they will have sufficient opportunities to pay attention in the future. If this is the case, it is best not to be a "sentient person".

After several jars containing experimental raw materials, more than a dozen shallow-bottomed round porcelain plates and a rather simple pallet balance were placed on the teacher's experiment bench, Dang Aiguo began the experiment while explaining. He first placed a dense and smooth piece of white paper on each end of the balance, and then changed to another piece of white paper. He saw that the balance was always in a horizontal state.

"This is a balance. It can maintain balance, which means that the objects at both ends are the same weight. To do this, you need to have a fulcrum on the center of the libra arm. I will explain the principle of this later when explaining mechanics. Now I will talk about the use of the balance first. It must be placed at a horizontal place. Before weighing, the balance arm must also be balanced. The pointer in the middle is pointed at the center so that it can be put into use.

The reason why I put white paper on the tray of the balance is that after weighing powdered objects on the balance, they will be stuck in the plate when they pour down. Because what we want to weigh is not white paper, but white paper must be placed on it, so before weighing the object, two white papers with the same weight should be placed to ensure that the weight of the objects weighed is equal."

Dang Paiguo has also specially compiled manuals for professional experimental personnel to learn about the usage and precautions of these experimental instruments. Now when he demonstrates it to the students, he will just talk casually. When the students use the laboratory and experimental instruments to the students in the future, they must be allowed to read the manual before using the first time.

At this time, Dang Aiguo picked up the measuring spoons from each jar and added almost the same amount of charcoal powder and sulfur powder to both sides. Then he bent down and paid attention to the pointer in the middle of the balance and made fine adjustments, while explaining to the students: "I use specially made measuring spoons. Each square spoon of experimental medicine has a fixed volume. Be careful not to mix the measuring spoons of each drug, so as not to mix different medicines together."

After spending some time to balance the experimental raw materials on both sides, Dang Aiguo took the paper just now, replaced it with a new paper, and added a portion of saltpeter powder of the same mass. Although he knew that because the molecular weights of these three substances were different, even if each portion weighed was the same, it did not mean that the number of particles contained in it was the same. However, in the actual production process, the same mass was easier to determine than the number of particles, so he naturally used the weight-weight method to demonstrate.

As for molecular mass, particle number, etc., we can just mention it to the students when talking about chemistry later. After all, these physical quantities cannot be measured with current experimental equipment. Party Patriotic can only allow those Taoists to use the same volume of carbon element - graphite to measure the relative mass of other substances that are not very pure at all.

If you ask why it is so troublesome, it is naturally because the Party and the country only remember that the relative atomic mass of carbon is 12, hydrogen is 1, nitrogen is 14, oxygen is 16. After all, this knowledge is not commonly used and it has been too long. It is normal to remember it, but it is strange to remember it firmly.

——Does the time travelers who hold these books to review every day and learn a lot of professional knowledge that he can't use at all, and may they even carry a solar laptop full of various professional theoretical knowledge and specific manufacturing processes with them. They have long given up their usual life in advance and are waiting for the day of "premeditated accidental travel"?

Dang Aiguo spent some energy on weighing and mixing the experimental raw materials. He placed 1:1:1, 1:1:2, 1:2:1, 2:1:1... and other mixtures of charcoal, sulfur, and saltpeter powder in different proportions, which were all done. He walked to the front door, opened the door and stretched out his head to ask the school worker waiting outside for a freshly lit incense, and then closed the door and returned to the front of the experiment.

At this time, he saw Xiao Qiao sitting behind the first row of the experiment bench, twitching back, cleverly covering her ears and opening her mouth wide, and couldn't help but laugh: "Xiao Qiao, don't be so nervous. Although I said that this experiment is more dangerous than the flour explosion just now, all we have to do is burn experiment. The amount of the experimental medicine is very small and it is not limited to a small space, so there will be no explosion."

Then Dang Aiguo held up the incense and said to the students, "Pay attention to the burning speed in each plate", and used the incense in his hand to light the left-most plate. The powder mixture in the plate emitted a bright flame and a slight "scream" sound. Every time I looked at the tiny leaping flames and smelled the scent of sulfur, Dang Aiguo couldn't help but think of the scene when he was a child and the "brothers and sisters" in the orphanage who broke the unlit firecrackers picked up from nearby and poured the gunpowder inside into a pile of lit play.

A wisp of blue smoke appeared in this plate and was extinguished, and the power of gunpowder was not visible at all. The Party Patriotic unconsciously continued to order the second... the third... the degree of burning of the mixture of different proportions was naturally different, but one of them was close to the correct formula of black gunpowder - even the three mixtures had different integer ratios from 1 to 9, which was more than a dozen.

ps: Well... I feel like there is no motivation in the book review area now? We can’t use up the essence and special rewards every month. It’s so lonely... If you have any ideas, say it. How can we know if you don’t say it? In addition, please ask readers who like this book to create a reader group for everyone to discuss it? After it is built, it’s just posted it directly in the book review area. Let’s just put it on the top, 3q.
Chapter completed!