Zombie Crisis: Survival comes first

Hearing this, Chen Yu's eyes lit up: "Speak quickly!"

"Haha, don't worry, I'll tell you as we walk." Xiao Jiu turned around and walked halfway up the mountain, then continued: "What I want to teach you is how to make black gunpowder!"

After finishing his words, Chen Yu was slightly startled: "How come you can even do this? It seems that the special forces really pay attention to all-round development. To be honest, I have long regretted that I never became a soldier."

"Not entirely, some of them are things I am interested in learning." Xiao Jiu shook his head slightly.

"Now is the time to talk to you about the structural principles of bullets. I won't go into the complicated ones. I'll talk to you about two aspects first, that is, the primer and the gunpowder in the bullet case."

"Many years ago, we used black powder, but in modern times, it has basically been replaced by smokeless gunpowder. There is no need to explain this type to you in detail. Let's just talk about the previous one."

"Okay, I promise to remember it!" Chen Yu nodded, not giving up the opportunity to learn at all.

In his opinion, there is no conflict between reading thousands of books and traveling thousands of miles. Some things that were not learned in books are more precious now.

Xiao Jiu grabbed a small tree and climbed up the slope. Then he turned around and pulled Chen Yu up, and continued: "Do you know why the bullet was fired?"

Hearing this, Chen Yu took out his pistol, looked behind the gun, and replied doubtfully: "There seemed to be some pointer that hit it, and then the bullet was fired."

Hearing this, Xiao Jiu walked beside him and explained with a smile: "When the pointer hits the base of the cartridge case, the gunpowder in the lower area will be ignited, which will trigger the gunpowder inside the cartridge case. Then due to the instantaneous surge in pressure, the warhead will be affected. It will fly straight ahead."

"That's why the gun barrels are designed in a straight line, right?" Chen Yu understood a little and said immediately.

"Yes, because the bullet can only go forward at this time. If the barrel is bent, it will explode directly."

"Oh, then I understand." Chen Yu remembered it in his mind and nodded: "If it weren't for the end of the world, I wouldn't have access to a lot of knowledge in this area, let alone running around the mountains with a pistol now."

After saying this, he continued to put the pistol away so as not to lose it.

But Chen Yu soon thought of something he had seen before, so he could ask now, so he said: "By the way, Brother Xiao, I saw in the movie that some killers would use that kind of ice cubes when performing tasks. Made of bullets, if you kill the mission target in this way, the bullet will melt and others will not be able to find clues afterwards. Is it true or false?"

After hearing what he said, Xiao Jiu stood there, turned around and said with a smile: "You said it was a movie, so the result should be obvious, right?"

"I think it's fake, but I can't give a specific reason..."

"I've already told you the answer. Just think about it and you'll understand." Xiao Jiu laughed and walked under the tent.

Then Chen Yu stood there and carefully recalled what Xiao Jiu had said before. Suddenly his eyes lit up and he suddenly realized.

Then he chased after him and shouted excitedly.

"The bullet is fired because the gunpowder is ignited, so at this time, the temperature inside the barrel should be very high, but the ice itself will melt when it encounters high temperature, not to mention the size of the bullet. It is estimated that Before it flies out of the gun barrel, it will melt into the gun, right?"

"You're right." Another voice sounded. Chen Yu turned around and saw that it was Uncle Wa.

"Give the things to Mouse, and you come with me." After saying this, Uncle Wa turned around and walked in the other direction.

Seeing this, Chen Yu handed the pot to Mouse and looked at Xiao Jiu with some confusion: "By the way, Brother Xiao, didn't you teach me how to make black powder? Why did Uncle Wa ask me to follow him again?"

Hearing this, Xiao Jiu put the bag of glass bottles under the tent, turned around and said with a smile: "How can we make it without raw materials? It's useless to have a method!"

Hearing this, Chen Yu reacted instantly and left quickly with Uncle Wa. Before leaving, Lin Yi came up to hug him and told him to be careful.

At this time, Jiang Yuchen also heard the word "raw materials" they mentioned. Although he didn't understand what it was, he quickly thought of what he could do and couldn't help but look forward to it.

......

Chen Yu followed Uncle Wa, and the two chatted from time to time on the road. They walked for about half an hour before finally leaving the mountain.

"Why don't you go out from the entrance and go into the mountain?" Chen Yu looked at the road behind him and clicked his tongue.

"Because that's what we're looking for."

After finishing his words, Chen Yu followed Uncle Wa's eyes and looked at an old house by the river, and was stunned.

Because judging from the sight, the house has collapsed into disgrace.

And unlike the cement and red brick houses before the apocalypse, this one by the river is obviously an old house from many years ago, as old as it can get.

Although he was a little confused, Chen Yu didn't ask any more questions because he knew that Uncle Wa would definitely take the initiative to explain the reason to him.

After all, nowadays, everyone's relationship is different from the past, and they are becoming more and more familiar.

Sure enough, as he got closer and closer to the collapsed house, Uncle Wa's voice came out.

"Black gunpowder is composed of potassium nitrate, charcoal, and sulfur. We have three raw materials, the latter two of which we have collected. The rest..."

Before Uncle Wa finished speaking, Chen Yu opened his eyes and said, "I followed Brother Xiao to get this thing in the morning. We are all here."

Hearing this, Uncle Wa turned to look at him, with no expression on his dark face. He asked in a deep voice: "Let me ask you, where does your potassium nitrate come from?"

Hearing this, although Chen Yu was a little confused, he still said truthfully: "It's extracted from chemical fertilizers. You must know better than me."

After finishing his words, Uncle Wa asked again: "What if there is no chemical fertilizer?"

"Ah? What do you mean?"

Looking at his somewhat confused expression, Uncle Wa was not happy at first, but thinking that Chen Yu was once just an ordinary young man, unlike people like them who licked blood from the tip of a knife, he didn't seem to know much about these aspects. Also normal.

Moreover, Chen Yu has grown very fast nowadays, so Uncle Wa's attitude has slowed down a lot and he said seriously: "What Xiao Xiao teaches you is how to extract what you want from the existing materials."

"And what I want to teach you is to find the same substances from the natural environment to make the same gunpowder. These methods can save your life in many cases, especially in the end of the world."

"I understand." Chen Yu nodded solemnly: "I will never let you down. Although I still rely on your protection now, I will definitely stand in front of you in the future."

Uncle Wa stared at Chen Yu for a few seconds, and then nodded with satisfaction: "Xiao Xiao and I both believed in your character, so we worked hard to train you. After all, if you want to enjoy the shade under a tree in the future, you have to dig it now." Trees are planted in the pit.”