"Look at it slowly. This book was translated by me. You can just read it by yourself. The original words used were not the Tang Dynasty, 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.

"The sea water in the salt fields is also salty," Li Zhi replied.

"That's it." Gu Qing continued, "We incorporate salt into the water to increase the weight of the water, which involves a density theory."

"You lend me a book to read, and I can think about it when I go back." Li Zhi said, "So as you say, there is salt in the sea water, so the sea water is heavier than the lake water, will the buoyancy of the sea water be greater than that of the lake water?"

Gu Qing smiled and nodded.

"Okay, I get it."

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

"Yes." Gu Qing said.

"Why? This seems to be different from what we usually think." Li Zhi asked.

Gu Qing Shen Shen said, "A man named Archimedes said that the buoyancy that an object receives on the water surface is related to the density of water, the volume of the water discharged by the boat and the speed of gravity. Therefore, although the iron-made ship is very heavy, the volume of the water discharged by it is also very huge. 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, you can know that the ship can float on the water surface."

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

"As you say that the iron ship is impossible to achieve?" Li Zhi said again.

"I'm raising a chestnut." Gu Qing continued, "We might as well change something, wood. We know that no matter how big the wooden block is, it can float on the water, right?"

After hearing this, Li Zhi had some ideas, "What does it mean?"

"Weight is irrelevant, but something called density." Gu Qing said again, "Iron is very hard, but the wood is relatively soft. Because the wood is not as strong as iron, the iron will be very strong when it is firmly connected to it. Therefore, the density of iron is much greater than that of wood. The inside of the wood is actually loose. Your Highness Jin might as well try it. Which one is hollowed-in wood or a solid wood of the same weight is higher."

"This is very simple, it must be the hollow floating height inside." Li Zhi replied, "The weight remains unchanged, but the inside has changed, and I seem to understand a little."

Gu Qing continued, "A different size and the same weight can also be used for experiments."

"I understand! I'll try it." Li Zhi seemed to open a new door in his heart, and a new knowledge slowly emerged in his mind. He hurriedly left the Gu family and went to the Haimao Department.

"Youthful." Gu Qing sighed as Li Zhi hurriedly left.

A few days later, the Gu family's road construction continued. Today, Gu Qing met a guest but Wang Jin who had not seen for a long time.

He walked up to him politely and said, "Eunuch Wang, long time no see, have you encountered any problems in the Firearms Bureau?"

"Drag the prime minister's blessing, the Firearms Bureau has always been very safe. The matter involves the secrets of the country. Please do not ask more questions and do not make things difficult for Lao Nu. Lao Nu will not take the Marquis to see the Firearms Bureau." Wang Jin said.

"I didn't say anything yet. Besides, I'm a supervisor at least," Gu Qing said.

"It's really not possible." Wang Jin smiled bitterly.

"Okay." Gu Qing nodded in compromise, "There is 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. You can't owe me my salary in the court, right? It's been so many years, I haven't seen a copper plate."

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

"There is no need to be too little money." Gu Qing said.

"This old slave really can't make decisions for Mr. Gu. Your Majesty has been waiting for Mr. Gu for a long time. Why not talk to Mr. Gu and Mr. Gu." Wang Jin said.

"Which Majesty?" Gu Qing subconsciously glanced around.

"The one from Ganlu Palace." Wang Jin said, "Now we are waiting for Mr. Gu in the Peach Blossom Forest behind the academy."

Li Chengqian wants to see him? Gu Qing thought it was time. Li Chengqian had been waiting for so long and could not sit still. "Lead the way."

Wang Jin smiled slightly, "Master Hou, please come here."

Behind the academy is a peach blossom forest. Now it is February, and buds can be seen on the peach trees.

When Gu Qing walked into the peach blossom forest, he saw Li Chengqian sitting not far away. When he walked to him, Gu Qing didn't politely sit down.

Seeing Gu Qing's actions, Li Chengqian said expressionlessly, "Long time no see, it's been a while, and you and I haven't sat down and talked well."

"Have we sat down and talked well?" Gu Qing said with a smile.

As soon as Li Chengqian and Gu Qing met, they smelled of gunpowder, and Wang Jin stood aside and remained silent.

Gu Qing continued, "Your Majesty, I am a businessman. The businessman pays attention to sincerity. Your Majesty has left Chang'an and has seen him. I am so happy. But you still have so many swords and axes, which really makes me wonder if Your Majesty is here to take the head of my neck this time."

Wang Jin's face changed a little, and the spies around him were hiding very well. How did Gu Qing discover it? These people came to protect His Majesty.

"I'm sorry this is my territory. I naturally can't understand the depth of Chang'an. The turbulence of this village can't escape my eyes."

Looking at Gu Qing's confident smile, Li Chengqian waved his hand, and Wang Jin also whistled, and there was a figure shaking in the hidden areas around him.

"Everything has been withdrawn, Your Majesty." Wang Jin said to Li Chengqian.

"Is there anything else that I'm not satisfied with?" Li Chengqian asked Gu Qing.

"It's gone." Gu Qing smiled and took the wine pot that Li Chengqian placed aside and poured the wine for himself.

"I remember the last time I saw you, you pointed at my nose in the Ganlu Palace and scolded me. I still remember this matter fresh."

"It seems that His Majesty is a little clear about the purpose of his visit this time." Gu Qing also looked directly at Li Chengqian, "Is Your Majesty the time to settle the score for the first time?"

Wang Jin was about to break down when he saw the current emperor and the current wealthy Mr. Hou, who was now rich, thought that the two of them would not fight at that time.
Chapter completed!