one's door

Chapter 136 Knowledge
Putting Zeng Hao on the floor, Zhang Yan took care of him for a long time, and closed his eyes for a while in the middle of the night.Strictly speaking, Zeng Hao drank so much, it's normal for him to be drunk like this.At least after nightfall, I didn't toss about much, and fell asleep honestly.

It was just dawn, and Zeng Hao, who had been sleeping since the afternoon and had been drinking all night, was completely awake, or he was thirsty. He turned over from the floor and got up, went to the table and poured three bowls of water for himself to grow. exhaled.

"woke up?"

"Ah? Oh! Wake up!" Zeng Hao was startled, turned his head and saw that it was Zhang Yan who came back to his senses, and those feats on the wine table before came to his heart, and for a moment he was slightly pale because of drunkenness Then he became a little red, thinking of his drunken appearance, he was afraid that Mr. Zhang would make fun of him for a while?
However, Zhang Yan didn't want to make fun of him like Zeng Hao thought. He was helping to block the wine. This kind of favor can be recognized, how can he make fun of him?

Zhang Yan quickly rolled up the floor, then got up and said to Zeng Hao: "Go, go and get some water back. The things I washed and vomited for you yesterday are almost used up."

"Huh? Sir, then I will come."

The sky just started to light up, and it was still early, but there were already quite a few early risers in Zhuzui Alley, and the Dashuijing side had the most people.To fetch water, you have to wait in line for the first three or two people.

Zhang Yan stood on the side with his hands behind his back, while Zeng Hao lined up carrying a load and two empty barrels.Looking at the honest baby in front of him, Zhang Yan smiled and decided to give him some advice.

"Have you learned anything from Langyuan these days?"

Zeng Hao was taken aback for a moment, and then became inexplicably nervous, knowing that this should be an impromptu test by Mr. Zhang.After thinking for a while, he said: "Mr. Hui, I have been helping in the carpentry shop for the past few days. I have learned a lot about wheelchairs. I think wheelchairs are just appearances, with more wheels. Really. To use it elsewhere is actually inseparable from it.”

Zhang Yan was quite surprised by this answer. He thought that Zeng Hao had studied with Luo Changshan for many years, and would be influenced by the closed school concept of miscellaneous studies. He would be limited to specific things and lack expanded thinking.But now it seems that he still underestimated the other party.It is also possible that together with Miscellaneous Studies, it is not as closed as the outside world makes it out to be.

"You speak well. In fact, they are very simple things, and they will have different effects when used in different places. The important thing is not the shape, but the meaning. Master the key, and then you can transform it into countless things. This is the core concept of applying what you have learned. I wonder if you would like to hear it?"

Zeng Hao nodded again and again. If he hadn't still carried a burden on his shoulders, he would have bowed solemnly to show his attitude towards learning.

"Don't stand still, it's your turn to fetch water." Zhang Yan patted Zeng Hao's shoulder.Half a dozen children are endless energy, and carrying water is the best labor.

"Oh!" Zeng Hao hurried forward. The people in front of the line had already fetched water and left. He really couldn't stand and block the people behind.

"You see, this wooden barrel floats when it falls on the water surface. After shaking it a few times, it will sink after entering the water. If it is filled with water, it will not sink to the bottom, but it will be difficult to float up. Why? ?”

"Sir. The wooden barrel floats because the wood is lighter than water. When water enters, the wooden barrel is under pressure, so it sinks into the water, but its pressure is limited, so it will not sink to the bottom. Only rotten wood, water after soaking It will sink to the bottom only if it can be immersed in it.”

Seeing Zhang Yan's question, Zeng Hao thought he was still testing his own knowledge, so while carrying water in his hand, he answered Zhang Yan's question word by word with what he had learned.

But Zhang Yan asked again: "It is true that it is lighter than water. But how to measure it? The wooden barrel can weigh a catty, and the water can also weigh a catty. How do you compare?"

"Sir, what I mean by "lighter than water" means that if water and wood are of the same size, the wood will be lighter." Although he didn't understand why Zhang Yan would ask this basic truth, Zeng Hao still did it honestly. answered.These things are not very advanced in the field of miscellaneous studies.

"According to your statement, as long as it conforms to the "same size but lighter than water" things can float, and vice versa?"

"of course."

"Have you ever seen a pottery pot? According to what you said, that thing is heavier than water, but why can it float on the water?"

"This is because"

"Actually, it's not just clay basins. You should have seen copper basins, right? Isn't that guy heavier than water? Can't it also float on water?"

"This..." Zeng Hao was immediately confused.Even the movement of fetching water in his hand stopped.

Zhang Yan smiled and said nothing, took the bucket from Zeng Hao who was in deep thought, continued to fill up the water, then took up the burden and walked back.And Zeng Hao followed behind as if he had left his soul, muttering in his mouth and didn't know what he was talking about.

After going back and forth several times, after Zhang Yan refilled the water tank at home, and sat down to drink tea and have breakfast, Zeng Hao looked at Zhang Yan with confused eyes and said, "Sir, what's the point?"

"Actually, what you know about the "weight of the same size" is not wrong. It just misses the specific difference in the "size". A piece of copper weighs two or three catties in the size of a palm, and water in the size of a palm weighs only two or three ounces." Many. But a palm-sized copper block can be made into a large washbasin in the hands of a craftsman. At this time, should the "size" be compared with the size of the copper block before or with the size of the washbasin after stretching? Compare?"

After Zhang Yan finished speaking, he saw that the confusion in Zeng Hao's eyes had dissipated a lot, and he was a little more surprised.It should be the joy of lifting a little veil over the natural world.

But Zhang Yan knew that his explanations about buoyancy were neither precise nor concise.Putting the answer sheet on the earth like this is the kind that will deduct points.

But this is the answer that Zhang Yan came up with based on the general logic of the natural sciences in Huang Tianyu.It doesn't need to be so precise, what he has to do is "guidance".As long as a true scholar has a correct direction, he will gradually figure it out.

"You see, what you have learned, but you don't make sense of it on a mere "bucket problem". .”

"Sir, is this the meaning of "applying what you have learned" that you have always mentioned?" Zeng Hao seemed to understand the real purpose of Mr. Zhang's testing of him today.

"Hahaha, this is the opinion of my family. I don't dare to say that it is definitely right, but at least it can give you one more reference for future studies. Learning and learning, you can't just enter and leave. Are you right? Well, although what I said today Not many, but I believe that you will have a lot to think about after you come down. Eat first, and then follow me to see the new house after dinner. If you don’t rush to learn for a while, just think about things you don’t understand.”

(End of this chapter)