A scholar of Zhenguan in the Tang Dynasty

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"I knew this woman was not simple." Gao Yang said, "Sister Wu Mei, I'll go to her door and ask her what Li Ran means. I haven't said anything about this woman who surrounds Gu Qing all day long, but she keeps pushing her boundaries. .”

"Okay, okay." Wu Mei comforted Gao Yang, "I'll take care of this matter. You are a princess and you have to pay attention to your identity. I'll take care of the outside affairs. Just watch your home."

"Yeah!" Gao Yang nodded seriously, "I'm going to worry about Sister Wu Mei again."

"It's okay." Wu Mei held Gao Yang's hand and said, "Every family has troubles, but Li Ran's methods are not simple. She can become the head of the Li family in Zhao County, which shows that she is not an easy woman to deal with. This is a chance for me to meet her."

"Do you need me to do anything?" Gao Yang said.

"No, just keep an eye on your home, if anyone disturbs you, just call out." Wu Mei said.

Thinking of this, Gao Yang hesitated and said in a low voice, "Sister Wu Mei, you said that this Li Ran has been in his [-]th year and has never been married."

"I know what you are worried about. Don't worry, our Gu family's door is not so easy to enter." Wu Mei said with a smile.

This made Gao Yang relieved a lot. Wu Mei is a person who can do things, and Wu Mei is the host from all over the house. Following Gu Qing, Li Ran is different, Li Ran is a woman with means, if she can do things for Gu Qing that are sorry for Wu Mei and sorry for her family, Gao Yang will definitely not tolerate it.

Li Xiang was playing with the Rubik's Cube, and finally put all six sides together, "Teacher, look."

Gu Qing took the Rubik's Cube, "You can learn how to play the Rubik's Cube in such a short time."

"Brother Gu Xiao taught me." Li Xiang said with a smile.

"Actually, the principle of the Rubik's Cube is very simple. When you turn one side, the other sides will also rotate together, just like how we usually do things. Sometimes we can't just look at the front, but also look behind." Gu Qing low Said in a low voice, "Some people can't wait to achieve a goal. If they can't calm down, they will not be able to do anything well."

Li Xiang listened very carefully.

While talking, Gu Qing looked around him, "Where's Gu Xiao?"

"Brother Gu Xiao followed Uncle Zhang to catch fish." Li Xiang replied.

Gu Qing nodded reassuringly.

Li Xiang stood by Gu Qing's side for a while before speaking, "Teacher, that..."

"what happened?"

Li Xiang summoned up his courage and said, "Can I go and read the books in the study? Brother Gu Xiao said that the books in the teacher's study contain a lot of knowledge that you can't even learn in the academy."

"Go." Gu Qing nodded.

"Thank you teacher." Li Xiang happily went to the study.

Walking into the study, I saw that Li Zhi was also looking for books here, "Is the emperor also reading?"

"I looked at previous books on buoyancy. The buoyancy of the ocean seems to be different from the water in our usual lakes." Li Zhi said and found a book. This is the earliest physics written by Gu Qing, which is similar to what the academy taught. Not the same.

Many unused concepts were eliminated.

"Is there any difference between ocean water and lake water?" Li Xiang asked.

"I'm not very clear." Li Zhi said, "I thought about building iron ships a long time ago, but this concept has never been implemented. Today's sea ships must be stronger than before if they want to sail farther, so I want to Using iron to build a ship involves many issues, such as buoyancy, weight, material, and so on.”

"I don't understand." Li Xiang shook his head vigorously.

"You don't need to understand this." Li Zhi took a book from the shelf and said, "This book is very suitable for you. It's called psychology, and you can use it when you interact with people in the future."

"Thank you, Uncle Huang." Li Xiang said awkwardly, "In fact, I just know that there is a lot of knowledge in the teacher's study, but I just don't know what to read."

Chapter One Thousand and Three

"Look slowly. I translated this book. You can just read it if you are a bit sloppy. The original characters are not Tang characters, so you can't understand them."

"Thank you, uncle." Li Xiang said again.

Touching his nephew's head, Li Zhi left the study and came to Gu Qing's side, "Gu Qing, do you think there is any difference between sea water and lake water?"

"Do you know where the salt comes from?" Gu Qing also asked back.

"Salt fields, sea water is also salty." Li Zhi replied.

"That's it." Gu Qing continued, "When we mix salt into water, we increase the weight of water. This involves a theory of density."

"Lend me this book, so I can think about it when I go back." Li Zhi said, "If you say that there is salt in the seawater, then the seawater is heavier than the lake water, and the buoyancy of the seawater is also heavier than that of the lake. The water is bigger."

Gu Qing smiled and nodded.

"okay, I get it."

Just about to leave, Li Zhi turned around and asked, "Gu Qing, many years ago, before the establishment of the Maritime Trade Department, you mentioned the concept of an iron ship. Can iron really float on the sea?"

"Yes." Gu Qing said.

"Why? This seems to be different from our usual cognition." Li Zhi asked.

Gu Qing said in awe, "A man named Archimedes said that the buoyancy of an object on the water surface is related to the density of water, the volume of water displaced by the boat and the speed of gravity. Therefore, although a boat made of iron is very It is heavy, but the volume of water it displaces on the water surface is also very large, and the buoyancy generated by these very considerable displacements is equal to the gravity of the ship itself. According to the law of conservation of force, it can be known that the ship can float on the water surface.”

"The real mystery of buoyancy is actually an effect in the interaction." Gu Qing continued, "We know that no matter how big or small an iron is, it will sink to the bottom of the water. In fact, it has nothing to do with the weight. No matter how big an iron is, it will sink to the bottom of the water. Regardless of sea water or lake water, His Royal Highness King Jin can try this."

"According to you, the iron boat is impossible to realize?" Li Zhi said again.

"I'm lifting a chestnut." Gu Qing continued, "Why don't we use another kind of thing, wood, we know that no matter how big a piece of wood is, it can float on the water, right?"

Hearing this, Li Zhi had some ideas, "What do you mean?"

"Weight is irrelevant, but something called density." Gu Qing said again, "Iron is very hard, but wood is relatively soft, because wood is not as strong as iron, and iron will hold everything together firmly. It is strong, so the density of iron is much higher than that of wood, and the inside of wood is actually loose. Your Highness Jin Wang might as well try, which one floats higher, a piece of wood with a hollowed out interior, or a solid wood of the same weight."

"It's very simple. It must be the height of the hollow inside." Li Zhi replied, "The weight remains the same, but the inside has changed. I seem to understand."

Gu Qing went on to say, "We can also do experiments with different volumes and the same weight."

"I understand! I'll try it." Li Zhi seemed to open a new door in his heart, and a new kind of knowledge slowly emerged in his mind, and hurriedly left Gu's house and went to the Maritime Trade Department.

"Youth." Gu Qing looked at the back of Li Zhi leaving in a hurry and let out a long sigh.

A few days later, the Gu family's road construction was still going on, and today Gu Qing saw a guest who was Wang Jin who hadn't seen him for a long time.

Going forward politely, Gu Qing said, "Long time no see, Wang Gonggong, did the Firearms Bureau encounter any problems?"

"Fortunately, Xiangguo, the Firearms Bureau has always been safe, and the matter involves state secrets. Please don't inquire too much about it, and don't embarrass the old slave. The old slave will not take the Houye to see the Firearms Bureau," Wang Jin said. .

"I haven't said anything yet, besides, I'm also a supervisor anyway." Gu Qing said.

"No way." Wang Jin smiled wryly.

"Okay." Gu Qing nodded compromisingly, "One more thing, I am the Prime Minister and I am the supervisor of the Firearms Bureau. My salary has not been paid for many years, and your court can't owe me my salary, right? For many years, I haven't seen a single copper plate."

"Are you short of money?" Wang Jin smiled wryly again.