After five years of teaching support, Daming became an empire on which the sun never sets.

Chapter 165 Improved Musket
The crowd was shocked, and they all rushed in front of Qin Yu, wanting to see what happened.

"Lao Xu, I just said that no matter how high your martial arts skills are, you can't beat this thing. Do you believe it now?" Qin Yu asked with a smile.

"I believe, I believe." Xu Da kept saying.The fire gun made by Qin Yu can be fired instantly, and it can also shoot countless small bullets. Even if his martial arts are several times higher than now, it is impossible to avoid it.

I don't know if Zhang Zhenren can block it, he thought to himself.

And Zhang Sloppy next to him is also muttering in his heart, can I avoid such a powerful fire gun?It shouldn't work. Although others call me a god of loyalty and filial piety, I'm not really a god.

It turns out that Mr. Qin has such a powerful thing in his hand, even if the three Jinyiwei rushed in front of him last night, they would be knocked over.

Mr. Qin's last line of defense is not my old Zhang, but his gun.

"Mr. Qin, how powerful is your modified fire gun? How did you do it?" Xu Da asked. "The power of its launch seems to be more than ten times stronger than that of ordinary fire guns."

"And it also shot out countless small iron pellets, which are completely covered blows."

"Yeah, Mr. Qin, how can the fire gun you designed be so strong?" Zhu Biao asked.

"Also, it is still instant, how did you do it?" Xu Miaojin also asked.

At this time, the crowd was thinking the same thing. If they were holding such a fire gun, no matter how fast the enemy's cavalry rushed, they would still be killed before they could reach them.

"Teacher, teach us quickly." The crowd said eagerly.

……

"Everyone, don't be in a hurry." Seeing that the crowd looked impatient, Qin Yu said, "The principle is what the teacher wants to teach you."

"As a support teacher, the responsibility of the teacher is to impart new knowledge to you. You don't have to worry about the teacher not teaching. The teacher not only wants to teach, but also fears that you will not study hard."

Qin Yu is very satisfied with this group of students who are thirsty for knowledge.

"The teacher will not only teach you the principles, but also make it with you later."

"Huang Biao, Huang Le, you two, go and bring out the blackboard." He ordered, and he was going to teach outside the classroom.After all, this kind of knowledge requires a combination of teaching and experimentation, so that students can learn it more intuitively.

Soon, the blackboard was carried out by the two of them.When the crowd saw this, they immediately took out stools from the classroom, sat neatly in two rows, and listened carefully outdoors, with a more serious attitude.

Even Xu Da sat with the crowd and became a student.More than everyone else, he wanted to master the principle of this powerful firearm, because he always had a heart to fight in all directions.

秦宇首先在黑板上写了一个化学方程式：2KNO3+S+3C=K2S+N2↑+3CO2↑。

Then he picked up the pointer and pointed to the chemical equation above: "As you can see, the ratio of sulfur, potassium nitrate, and charcoal in the equation is one to two to three. This is the traditional black powder. Three charcoal is the source of your comparison. But this kind of black powder made by you can be used as a fireworks, but it is impossible to make more powerful gunpowder."

"Because when the black powder explodes, the following three violent chemical reactions will occur..." After that, he wrote three chemical equations below.When the crowd saw this, they hurriedly took out their notebooks and started recording. Even Xu Da recorded them.He rarely listened to Qin Yu's chemistry class before, so when he wrote those equation symbols, it was like writing a book from heaven.

On the other hand, Zhu Biao and others had learned the basics of chemistry before, and they wrote it decently.

"The conclusion drawn from the combination of these four formulas is that the correct ratio of gunpowder to achieve the greatest explosive power is 75% nitrate, 10% sulfur, 15% charcoal, or the second ratio, 75% nitrate and 12.5% sulfur. and [-]% ​​each for charcoal.”

"I made a copy of each of these two proportions of black powder. Let's go to the open space to test it and see the difference between the black powder made from these two proportions and the black powder made in the previous proportion."

After finishing speaking, he came to the open space next to him, and took out two small packets of black powder: "This is the traditional gunpowder made from sulfur, two nitrates, and three charcoal."

Put it on the ground and ignite it with flint, and soon the black powder is fully burned, and a not-so-big blue smoke emerges.

"Such power is only suitable for fireworks." Qin Yu said.

Then he lit another packet of black powder on the ground, "Boom!" In an instant, thick smoke billowed.

The difference between the two proportions of black powder is clear at a glance.Then I tried the third one, and it was equally powerful.

"So the latter two are the correct proportions of black powder." Qin Yudao said, "It will be more powerful and impactful when used in the manufacture of guns. The gas generated by combustion has a greater impact, and the iron pellets fired are of course more accurate. The higher it is, the more lethal it is.”

It turned out to be just the ratio of sulfur, saltpeter, and charcoal.Just changing the ratio of the three materials, the power of black powder is so much stronger than before, it is an earth-shaking change!

The crowd suddenly realized and completely grasped this knowledge point.

Then quickly recorded the two correct ratios that Qin Yu taught them.

"Actually, adding sugar to this gunpowder is even more powerful. If it wasn't for the fear of this ancient copper fire gun blowing up, I would have added it." Qin Yudao, "Everyone just needs to know about this knowledge point, don't do it. Go back and test without authorization, because the copper tube fire can't stand it."

Plus sugar is more powerful?The crowd was shocked again: sugar is just something to eat!

"Teacher, why is this?" Lu Qingqian asked curiously.

"Because after the sugar is mixed, the potassium nitrate will run to react with the sugar separately. During the reaction, more gas is generated per unit of substance, which of course means that the explosion will be more violent." Qin Yu said.

"So it is." The crowd suddenly realized.

"If you want to make guns more powerful, you must first understand the basic principles." Qin Yudao, "In short, after the gunpowder is ignited, a violent chemical reaction occurs in a small space, and a large amount of gas is generated to push the projectile. go out."

"So between the gunpowder, some small gaps are needed to make the chemical reaction of various substances more sufficient."

"I wonder if you have noticed that the gunpowder I make is granulated, not powder."

When the students heard the words, they all came over to take a closer look and found that it was exactly what Qin Yu said.The black powder he made was all tiny particles, and if he didn't say that the crowd wouldn't find it.

"So, to make the gunpowder explode more powerfully, there are two main points. One is the correct material ratio, and the other is the granulation technology."

(End of this chapter)