"Gunpowder? What's that? , how come you have never heard of it? He Le looked at Liu Yi very puzzled, it was the first time he knew the word gunpowder from Liu Yi's mouth, and countless big question marks suddenly popped up in his heart.

"Gunpowder is something that can explode!" Liu Yi explained while sitting on the action of an object exploding with his hand, but his explanation and action He Le didn't seem to understand what it was at all.

"What is the explosion?" He Le had never heard of Liu Yi's words, and his curiosity became more and more serious.

"An explosion can be said to be like an object that suddenly shatters and the debris flies out at a speed that no one can dodge." Liu Yi tried his best to make He Le understand, but He Le still didn't understand.

"Forgive He Le for being stupid, I really don't understand this, please ask the lord to explain it in more detail." He Le hugged Liu Yi with some guilt.

"Forget it, master, you go and get all the materials first, and when you make a gunpowder demonstration for you, you will naturally understand." Liu Yi doesn't like to explain the most, managing He Le is his follower, but Liu Yi just doesn't like too many explanations, he likes to explain with actions.

"That's good! My lord, you said you wanted me to prepare something, so I'll go! He Le saw that Liu Yi didn't want to explain too much, although there were still countless question marks in his heart, but Liu Yi was the lord he followed, and he didn't want to ask too much, so he could only make the thing called gunpowder, and then see how Liu Yi made the so-called explosion.

"Okay, you go and prepare potassium nitrate, sulfur, charcoal, the more the better." Liu Yi said. According to Liu Yi's calculations, there were already these things at this time, so he thought of making gunpowder.

"Lord, the potassium nitrate you are talking about is nitric acid?" He Le asked Liu Yidao.

"Yes, it's nitric acid, you go quickly! This is money" Liu Yi gave a bag of silver to He Le after speaking, and through the last search for horse thieves, Liu Yi and they still found dozens of taels of silver.

"Okay, I'll go!" He Le picked up the silver and went out, these things are not difficult to buy in Hanyang City, as long as you go to some alchemists, you can buy them, and there are many strange things in the Western Regions here, there is absolutely no lack of nitric acid, sulfur, as for charcoal, you can have firewood by yourself.

"Gunpowder, one of the four great inventions of mankind, seems to be about to be born in my hands ahead of schedule." Liu Yi sat alone in the room and was silly, his thoughts drifted far and wide, he even came up with rocket artillery, and he also decided to try rocket artillery in the future.

Liu Yi was alone for a long time, and Guan Yu came back.

"Big brother, the matter is done, three hundred people have entered the city one after another to hide, General Qu wants me to pass on the message, he will pay close attention to the situation of Geng Contempt's subordinates, and he will replace the guards of Yuanmen to facilitate our actions." Guan Yu reported to Liu Yi one by one.

"Okay, we'll act as soon as we get the chance." Liu Yi said excitedly.

"Big brother, what about Master He?" Guan Yu glanced at the house and saw no trace of He Le in the house.

"The master went shopping, and when he comes back, I'll open your eyes." When Liu Yi thought of gunpowder, he felt a little excited in his heart.

"Lord, come out and move things!" Liu Yi: They waited for more than an hour, and He Le shouted outside.

"Let's go, let's go and move the good stuff in." Liu Yi excitedly opened the door and walked out of the courtyard to pick up a clay jar, Guan Yu also picked up another jar with curiosity, and the three of them carried the jar to the house, and Liu Yi couldn't wait to open it.

"Okay, the materials are all right, second brother, you go and get a stone mortar for grinding medicine, and we will start grinding gunpowder." Liu Yi excitedly hurriedly asked Guan Yu to get the stone mortar, he couldn't wait to grind out the gunpowder.

"Gunpowder?" Guan Yu glanced at He Le in puzzlement, He Le shook his head and said that he didn't know either, and then looked at Liu Yi, Liu Yi was very excited at the moment and was really embarrassed to disturb him, so he had to suppress his curiosity and take the stone mortar.

"Big brother, Shijiu is here." Guan Yu came in with a heavy stone mortar after a while.

"Put it on the ground!" After Liu Yi finished speaking, he poured the nitric acid, sulfur, and charcoal that had been allocated just now, and he did not put it according to the old formula of one nitrate, two yellows, and three charcoal, but used the best gunpowder formula he had learned before to put it in sixteen: seven: three.

After putting the sulfur nitrate charcoal, Liu Yi took the heavy stone hammer and began to grind it, this grinding was half an hour, but the gunpowder was gradually ground out.

Liu Yi grinded for about ten more hours, and finally the gunpowder came out, he put the stone hammer down and grabbed a handful of gunpowder with his hand and smelled it. At this time, he was so emotional that he didn't know how to describe it, he grinded out the gunpowder and was the first person in the world to grind it out.

"Second brother, master, come and see, the gunpowder has been grinded out." Liu Yi excitedly shouted Guan Yu and He Le.

"Gunpowder out?" Looking at Liu Yi, who was holding a handful of gunpowder, Guan Yu and He Le immediately came over and grabbed a handful and smelled it.

"This is gunpowder? There's nothing special about him. He Le grabbed a handful of gunpowder and sharpened it with his hands.

It's not that Guan Yu doesn't know what gunpowder is, he just keeps smelling it.

"Big brother, can I take a handful? I like to smell it. Guan Yu said and smelled a handful of gunpowder, he liked to smell this smell very much, and he was addicted to it when he smelled it.

"Second brother, do you like to smell gunpowder?" Liu Yi looked at Guan Yu with strange eyes, no one in this world likes to smell gunpowder.

"Yes, I like it when I smell it." Guan Yu said that he was still putting a handful of gunpowder into a cloth bag that he didn't know where he had just gotten.

"I'm going to wipe it! I didn't expect Guan Yu to be a wonder. Liu Yi felt very strange that Guan Yu liked to smell gunpowder, he had heard of it in his previous life, he liked to smell gasoline, but he didn't expect that there was a Guan Yu who liked to smell gunpowder here.

"Alright, I'll show you the explosion now!" Liu Yi brought an empty jar and filled it with gunpowder, and then walked out of the house.

Guan Yu and He Le also walked out with Liu Yi full of curiosity.

Liu Yi came to the outside of the house to find an empty bamboo tube, poured some gunpowder into it, and then sprinkled the gunpowder all the way to a few meters away, he was going to make a simple firecracker for Guan Yu and He Le to see.

"Stay away!" Liu Yi shouted, Guan Yu He Le heard Liu Yi shouting and immediately retreated six or seven meters away, and Liu Yi took out a fire fold and blew it and ignited the gunpowder.

"Thorn!" There was a sound of gunpowder, and sparks kept walking towards the bamboo tube not far away, and Liu Yi also ran far away, he was not sure how powerful this firecracker was.

"Smack!" With a bang, the gunpowder in the bamboo tube exploded and shattered the bamboo tube.

And this sound also frightened Guan Yu's heart, and the most important thing is that this sound scared most of the people in the west of Hanyang City, and the aunts and aunts discussed it one after another, and some people were even scared to pee.

"Big brother, good thing, such a loud voice." Guan Yu praised it again and again, but even he was startled when he was usually not afraid of anything.

"Lord, after reading this, I finally understand what an explosion is." After reading the description of Liu Yi by the firecrackers just now, He Le understood a lot and also knew what an explosion was.

"Big brother, can you explain this explosion to me?" Guan Yu came over and asked Liu Yi, and Liu Yi only wanted to make a few more firecrackers at the moment, even if it couldn't kill people, it was very scary, especially Guan Yu was scared.

"You asked Master He to explain to you, I want to get a few more of these things." After Liu Yi finished speaking, he walked into his room, and he now wanted to make the lead to facilitate the detonation.

Looking at Liu Yi who walked into the house, Guan Yu had no choice but to call He Le to explain the explosion, and He Le also told Guan Yu according to Liu Yi's explanation, but Guan Yu was not born to make things, so he couldn't understand it.