Han Gang's words, Guo Kui just laughed. He heard too much of this kind of compliment: "Yukun's words can't be miscalculated, the old man went to Taiyuan to make the Son of Heaven feel at ease, but it was just to make the Son of Heaven feel at ease." ”

Guo Kui was so frank that Han Gang was deeply surprised. sighed: "It is enough to make the Son of Heaven feel at ease. If in the middle of the year, the Chinese martial arts of the dynasty can make the Son of Heaven feel at ease, how can there be a matter of cutting the land in Daizhou? ”

"The wood is already in the boat, so it's inconvenient to say more about this matter."

Guo Kui has actually sat in Guanzhong for the past two years, and gradually extinguished his fame. If he had changed his current state of mind and gone to Qinzhou, most of them would not have the intention of competing with Wang Shao for the control of the Xihe River. What if you get an opportunity? With the credit, how dare he ask for the reward of the imperial court?

In the current officialdom, Guo Kui, as a military general, has almost reached the highest point that can be reached. Although there is also a privy envoy above, if he really does this position, it will be Di Qing's fate immediately. Not to mention that he really sat on the main seat in the West Mansion, even if he thought about it a little, or if the Son of Heaven showed a little intention, the civil officials would never spare him.

Guo Kui walked slowly in the inner corridor of Daxiangguo Temple, "Yukun, you are now sentenced to the military weapons prison, and the old man is looking forward to Yukun You can achieve something in the weapons prison." Sanatoriums, thunderbolts, sleds, and military chess sand tables are all unprecedented, and none of them are inferior to the Divine Arm Bow. If so, the armor is strong and the guns are sharp, and the military uses them are all excellent, as long as they are reviewed a little, China's military strength will be able to deter the four people. ”

"Han Gang really plans to make a career in the Ordnance Prison, and he has an expectation. It's just that now I haven't seen the merit yet, and I don't dare to present it to Xuanhui. ”

Guo Kui glanced back at Han Gang, and the sharpness in his eyes did not diminish at all: "Su Zhiyukun, you are true to your words, and the old man will be relieved to have your words." ”

In the Great Xiangguo Temple, Guo Kui ordered a table of first-class vegetarian food and invited Han Gang to sit down and eat together, and Han Gang readily agreed.

Originally, Zhiyuan was going to invite Han Gang to dinner together, but someone from the palace passed him into the palace - Emperor Cao has been in poor health recently, and the imperial doctor's methods have not been effective, so he needs to ask the doctor for medicine, and in addition, he has to ask the monks in the capital to recite scriptures and pray for him. Zhiyuan, a famous monk dressed in purple and who has been attracting the hearts of the Great Song Dynasty for several years in the Hehuang Fan Department, is not only famous in Beijing for his medical skills, but also a monk in Zuojie, so he is naturally the first to be pointed.

After eating, after chatting for a while, Han Gang got up to say goodbye, and Guo Kui didn't keep him longer.

It is impossible for Han Gang and Guo Kui to get too close, and there is no need for him to get close to Guo Kui.

As long as Guo Kui does not commit civil taboos, no one can touch him. He has a reputation for being greedy for money outside, some of which are true, and some of which are based on the example of the Qin general Wang Qian, and outsiders have no way of knowing. However, Han Gang's proximity to Guo Kui would cause Shilin to discuss that the scholar could not tolerate a scholar who would serve as a martial artist, which would be detrimental to his reputation. As long as you do your best, the friendship between gentlemen is as thin as water.

After resigning Guo Kui and Guo Zhongxiao's father and son, Han Gang left the still bustling Daxiangguo Temple and returned home with a group of companions.

When I returned to my home in Changle Fang, which was located in the first compartment of the Right Army in the old city, I saw Zhang Dian sitting in the side hall, Feng Congyi was the first to accompany the guests, and the other guest was Lu Ming, who had not been seen for a long time.

Seeing Han Gang walk in, Zhang Dian didn't care that Feng and Lu were still present in the hall, and said, "Yukun, you are so leisurely!" ”

Han Gang was still leisurely, greeted Lu Ming, sat down and asked, "I don't know what happened?" ”

"What?" Zhang Dian was anxious for Han Gang, "It's just that you are too leisurely!"

When it comes to being knowledgeable and interesting, businessmen will not be half as bad as officials. Seeing that Zhang Dan's tone was wrong, Feng Congyi and Lu Ming immediately found an excuse and walked out of the city together.

For friends, Zhang Dan can be regarded as a heart-wrenching character. Su Shi often offended people because of his nonsense, and Zhang Dian often wrote letters to warn him. Although his friendship with Han Gang is mixed with many elements of political interests, it is true that the friendship has not reached the point of putting it in his heart. But Han Gang's behavior is very appreciative. In the past, the two helped each other a lot, and their political interests were closely linked, but now seeing that Han Gang's attitude was suspicious of Lu Huiqing, they couldn't help but worry about him. Of course, I am also afraid of making people profitable.

Zhang Dian knew that Han Gang had his own calculations, and he was walking at a predetermined pace, but others would not act at his pace: "Yukun." If someone else sentences the weapons superintendent, the Son of Heaven will never have any superfluous expectations, as long as he can see that the weapons are excellent. But you personally promised in front of the Son of Heaven that you would show off your talents in the Ordnance Prison, and now you haven't seen any movement for half a month, and you haven't even issued a sealed document, will the Son of Heaven have no ideas?! ”

Han Gang was already confident, and Zhang Dang's anxiety didn't infect him at all, but he just smiled lightly in the wind: "Han Gang also said early in the morning that he would follow Xiao Gui Cao......

Han Gang's understatement attitude made Zhang Dian seem to be the emperor and the eunuch were in a hurry, and his heart was full of anger: "Yukun, I won't ask you what you plan to do?" I just want you to make a move earlier, at least so that the Son of Heaven can see something. Otherwise, with the heart of the Son of Heaven, you will inevitably think that someone is secretly obstructing your actions, and Lu Jifu will inevitably think that your current silence is aimed at him. Or do you really have that in mind? ”

Han Gang smiled, knowing that Lu Huiqing was probably a little paranoid, and he was too suspicious of himself, maybe after the turn of the year, he would have to find a reason to rectify himself, so as to expel the disaster in advance, which is why Zhang Dian was so anxious. However, it is also possible that Lu Huiqing deliberately put on a posture of targeting himself, so as to attract Zhang Dian to come over to probe the bottom, as for Zhang Tun, there may also be an element of pushing the boat along the river.

But no matter what the situation is, Han Gang's plan is unspeakable, it is originally a conspiracy, no one can stop it, and there is no need to guess the other party's thoughts. Then he stood up: "Please come with Han Gang." ”

Zhang Dian was half puzzled, and followed Han Gang all the way to the study.

After dividing the guests and hosts to sit down, Zhang Duan looked into the room. The layout of Han Gang's study is very simple, there are not many furnishings, only the walls are plastered with lime. There aren't many books in the room, just a bookshelf on one wall. The desk against the window is placed with the four treasures of the study and a few volumes, which are very neatly organized. And there is a faint fragrance floating in the air in the room, this is not the smell of incense, but the smell of the incense powder used by the woman, it seems that Han Gang's red sleeves add incense to the life of reading at night, and live a very comfortable life.

But on the round table in the middle of the room there was a wooden basin, the size of which seemed to be used for washing feet. Appearing in the study makes people feel very awkward. There was water in the basin, and there was a piece of wood floating on the water, and a small wooden boat with very rough carving.

"What is this?"

Seeing the wooden boat in the basin, Zhang Dian remembered what Han Gang had said to him, whether the word 'boat' should be here.

Han Gang arched his hand: "Han Gang wants to consult the Naoyuan, I don't know why the Naoyuan can float on the water?" ”

Zhang Dian knew that Han Gang would not ask in vain, but he couldn't figure out the intention of Han Gang's question, and what the trap was, so he said hesitantly: "Because wood is lighter than water......

"That's right. But to be precise, wood of the same volume should be lighter than water. It cannot be said that this table is heavier than the water in the basin. …… The weight of the fixed volume, which I call density. For example, a liter of water, a liter of silver, a liter of iron, and a liter of wood all weigh differently, which means that they all have different densities. ”

The definition of various units is the focus of physics. The difference in weight and mass is not easy to mention for the time being, but units such as density and speed must be clearly defined.

Zhang Dian listened and nodded, although he didn't fully understand, but he still understood the general meaning, "That is to say, those that are lighter than water will float on water, and those heavier than water will sink to the bottom?" ”

That's exactly what happened! Stones are denser than water, so they sink to the bottom of the water, while oil is less dense than water, so they float on the surface. Han Gang said with great relief, he had instilled the definition of density in his wife and concubine in the past two days, but it took a lot of effort. It's not like Zhangdun, and you can understand it when you say it - naturally, which is also because of experience.

Han Gang picked up a small silver bowl on the table and threw it into the basin. I saw the silver bowl floating on the water, "Now the problem comes." Silver is much denser than water, i.e. silver of the same size is much heavier than water, so why can silver bowls float on water? ”

“…… The silver bowl was hollow, flattened and sank. Zhang Duan pondered for a moment before giving an answer. Raising his eyes, he asked Han Gang, "This answer should be known to everyone." ”

Indeed, silver bowls can float on water because they are hollow. Therefore, if the silver bowl is changed to a copper bowl, it should also be able to float on the water. ”

"Of course." Zhang's answer became more and more crisp.

Han Gang nodded, and asked again, "What if it is replaced with iron?" ”

"Iron? Iron Bowl ...... No, it's an iron ship! Zhang Dian finally reacted, suddenly jumped up, and pointed at Han Gang in a daze, "Yukun!" You're going to build an iron ship?! ”

"As long as the weight and size of the ship are calculated, an iron ship that can travel on the water can indeed be built. But this is only part of the story, and after discerning the truth, there are many things that can be built, but not just iron ships. Han Gang looked at Zhang Dian with a gaze that was Ning Ning, "Can the Zhiyuan know what the truth is?" ”

Zhang Duan sat down and said in a deep voice: "Yukun, don't sell it, just say it." ”

Zhang Dian is actually quite impressed by Han Gang's insistence on advocating the theory of learning from things. At the beginning, Han Gang personally verified that light objects and heavy objects landed at the same time in front of the emperor, and put the study of things on the table. After hearing about it, Zhang Dian also became interested in this. But when he went back and looked at the bamboo in the back of the courtyard for a night, he couldn't make a statement. The bamboo swings with the wind, and it is not difficult to compose poems and lyrics, but it can be replaced by a grid, but what do you want to grid? Zhang Dian couldn't think of it, and his brain couldn't turn around.

The scholarship advocated by Han Gang seems to be ordinary, and it can be seen everywhere on weekdays, but only when it is said can people suddenly realize. Zhang Dian had given up spending time and energy on this, he had too many things to do, but he didn't have the ability to be distracted and multi-purpose.

Han Gang smiled slightly, and handed over a stack of booklets bound from silk paper on the table, with only four simple words on the cover - "Buoyancy Tracing the Source".