Hearing Jia Xu's inquiry, Lu Bu laughed and said, "Because there are candles in Kongming lanterns, hot air will be generated after the candle is lit. According to the principle of thermal expansion and contraction, hot air will rise up against Kongming lanterns."

Jia Xu was like listening to a heavenly book, and couldn't help but frown and asked, "What is thermal expansion and contraction?"

Lu Bu couldn't help but explain: "Wenhe, I don't know if you have boiled water. When the boil is about to open, you will find that the bottom of the pot will bubbling upwards. This is because the hot water rises lightly and the cool water falls. Do you understand this time?"

"No!" Jia Xu shook his head.

puff!

"Okay, this is not the point, let's study a Kongming lantern!"

Jia Xu couldn't help but ask, "Lord, why is this kind of lamp called Kongming lantern?"

"this……"

Because this kind of lamp was first invented by Zhuge Kongming, but at this time Zhuge Kongming was just a little kid...

Lu Bu invented the Kongming lantern before Kongming.

Jia Xu couldn't help but say, "In the eyes of his subordinates, this lamp was invented by the lord, and it should be called Lu Bu lamp."

...

Jia Xu did not pursue why the Lu Bu lantern took off, and couldn't help but say happily: "Lord, when the sky dawns, let all soldiers make Lu Bu lanterns. When they light them up at night, they can defeat the enemy with fire!"

Lu Bu smiled and said, "Wait a minute, I need to study this Lu Bu lantern again."

Jia Xu asked in confusion: "What else do you need to study?"

Lu Bu explained: "I need to calculate that when the Lu Bu lamp rises to the top of the peak, the candles will burn out so that our goal can be achieved. Otherwise, the Lu Bu lamp rises to a very high before it burns, and it will not have any effect at all."

Yes, the lord is still thoughtful!

Hearing Lu Bu’s explanation, Jia Xu couldn’t help but realize it.

Soon Jia Xu frowned and asked, "But lord, how should we calculate this?"

There are really too many data that needs to be calculated. Even Jia Xu, one of the top strategists in the Three Kingdoms, is helpless in this calculation.

Lu Bu couldn't help but laugh and said, "Actually it's not too difficult. In this way, you can find some soldiers to cooperate with me!"

Lu Bu first took out a candle, measured the length of the candle, and then found a soldier to measure the time with the leak while lighting the candle.

Lu Bu led his men to walk quietly down the mountain for a long distance, and then found a vertical hillside. Lu Bu first measured the height of the hillside, and then Lu Bu asked a soldier to light a Lu Bu lantern below, and Lu Bu clocked the time on it.

Based on this, the speed of the rise of the Kongming lantern can be calculated.

Of course, this value is not accurate.

Because as the candle burns, the overall weight of the Lu Bu lamp will become smaller and smaller, and will become faster and faster during a certain period of time.

The speed calculated by Lu Bu can only be regarded as a reference meaning.

After calculating this, the remaining time is to wait for the candle to burn and record the time when the candle burns.

Of course, there is another most important data, that is, the height of the Xianglu Peak.

Based on the conditions at that time, this was difficult to measure.

Fortunately, in modern times, Lu Bu recorded all the data on some famous mountains and rivers in Jiangdong, and Lu Bu also recorded the height of Xianglu Peak, 354 meters!

With these raw data, you can calculate how long candles should be used.

When dawn was dawn, the candle was burning, and Lu Bu finally calculated a value after a series of calculations.

Of course, Lu Bu also knew that there must be some gaps here. Lu Bu finally obtained a data that he thought was similar after an error correction.

After dawn, all the soldiers got up, and then Lu Bu found about one-third of the soldiers and began to make Lu Bu lanterns.

First, we taught these soldiers how to make Lu Bu lanterns. Another important question is that we must keep the weight of all Lu Bu lanterns basically the same.

This can only work hard on the paper you make, and strive to make the paper used to make the Lu Bu lamp basically the same size.

After making the Lu Bu lantern, I found another problem, and there were not so many candles in the barracks.

Wow, think about it, when you go out torches, you mostly use torches at night, so why do you bring so many candles?

Then Lu Bu sent someone down the mountain to buy candles.

When it was dark, all the candles were shipped up.

Cut the candle into a uniform length and place it in the Lu Bu lamp. Now everything is ready, just wait until the night is quiet and the Lu Bu lamp is set off.

...

At the top of the Xianglu Peak, Peng Shizheng drank with several leaders of Shanyue, and there were seven or eight Jiangnan women they plundered and sang and danced to entertain themselves.

These women in Jiangnan are outstanding in appearance, but they are messy and haggard in their faces, and they even have to laugh and sing and dance for them.

Hu Zi took a few sips of wine and asked worriedly: "The boss, the officers and soldiers surrounded us under Xianglu Peak. Is it really okay? In my opinion, the officers and soldiers are really determined to kill us this time. There are no less than 100,000 officers and soldiers!"

Peng Shi was so angry that he slapped Hu Zi in the face: "Don't you bet! What's the 100,000 officers and soldiers coming? Twenty thousand officers and soldiers are so strong! You kid are drinking here with peace of mind. There is only one way up the mountain in Xianglu Peak. If you want to attack Xianglu Peak, don't even think about it if you don't have ten times the strength."

"Besides, those officers and soldiers are not fools. Do you think they will fight us to the death? Besides, the food we robbed is enough for the brothers to eat for three years! Do you ask those officers and soldiers who can stay here for three years? How much food does it take? They can't afford to consume it!"

In fact, even if Peng Shi didn't analyze, Hu Zi and the others understood this truth in their hearts, but after listening to Peng Shi's analysis, they felt more at ease.

Hu Zi asked carefully: "Boss, why don't we organize a battalion to scare them and let them get out early?"

Peng Shi curled his lips and said, "You are stupid! With the conditions of Xianglu Peak, as long as they dare to attack, not to mention anything else, we will throw stones down the mountain and easily kill them!"

"You stupid guy actually want to give up our great conditions and run down to fight them desperately? I said, what do you think of you? OK, if you want to go, you can go! Don't drink it anymore, hurry up and take your knife down the mountain to attack the camp!"

After saying this, Hu Zi's face turned green, and the other little leaders burst into laughter.

Hu Zi picked up the bowl and poured all the wine into his stomach, and stood up suddenly.

A little leader next to him said in horror: "Damn, Hu Zi, are you really going?"

Huzi ignored him, but strode directly to a woman singing and dancing, picked it up and walked out, walking up and down as he walked.

And this woman is like a puppet, with no expression on her face, and she lets the tiger invade, completely numb.

The other little leaders in the room laughed unscrupulously.

"Haha, my daddy is so funny! I thought Hu Zi was annoyed by the boss's words, and he really wanted to go down the mountain to attack the camp!"

"This kid is so cowardly. He was taught by the boss and didn't dare to retaliate. He just threw his anger on the women!"

"I'm drunk too much, so I'll go back to bed first!"

Another little leader stood up drunk with a drunken face, hugged a singing and dancing woman and walked out.

...
Chapter completed!