The tenth winter of Zhenguan was 627 A.D.

Compared with the 21st century when Lu Heng came, this time is almost half a primitive society.

There was no electricity, no gas, and no internet, so everything had to be built from scratch.

Lu Heng also knows very well that it is extremely difficult to build Datang into the appearance of future generations, even if he is a traverser.

First of all, the most important point is that there is no soil for scientific and technological development here.

The class of Shinong industry and commerce is deeply rooted in the hearts of the people.

The craftsmen and businessmen at the bottom are the most despised, but they are the talents most needed for the development of science and technology!

Later, the source of the Western Industrial Revolution was that commerce began to flourish, businessmen needed a lot of productivity, and simple manpower could no longer keep up with market demand, so they would put their ideas on technological reform.

Obviously, Datang does not have this background condition, or the small peasant society does not have it.

It is precisely because of this that Lu Heng insists on creating conditions to come out!

The purpose of the production of the Zhenguan series of wines is not to destroy the family, this is just incidental.

The most important thing is that he hopes to use the huge commercial attributes of this wine to drive everyone, including Li Shimin, and tell them that only when productivity keeps up will there be greater benefits!

Now, the first step has been reached.

At the beginning, the effect of Zhenguan ten years of spring was initially revealed.

Lu Heng came back to his senses, looked at the group of students in front of him, and said in a loud voice:

"See the lid of this pot? Do you know why it was clearly just covered with a pot, but for some reason it suddenly popped up on the ground? ”

The students looked at each other and hesitated for a long time before the first person finally spoke.

"It's because the water in it is boiling."

Lu Heng shook his head.

"What I'm asking is, why does the lid move when the water is boiled?"

No one answered.

It's not because they're stupid.

Among the students, there are many children who have read and can read and write, and they have received a fairly good education before they fall behind in the family.

They can't answer because it's something that doesn't need to be thought about at all in the minds of ordinary people.

When the water boils, the lid of the kettle will naturally move, what's wrong with that?

No one could answer, this was Lu Heng's expected result.

He paused, turned back and pointed to the lid that was still rattling, and spoke word by word.

"I'll tell you how much knowledge you can see from here—"

"This is an iron kettle, and the heat transfer performance of iron is better than that of pottery porcelain, so the water of the same size boils faster in the iron kettle."

"I specially asked Foreman Chen to build an iron kettle without a spout, because it was easier to see it this way."

"After the water in the pot is boiled, the water in the pot will slowly decrease over time and eventually become non-existent, which is called boiling dry."

"Water doesn't disappear out of thin air, nothing goes out of thin air, they just exist somewhere else in another way and state."

"It's like less water in a jug."

"When the water is boiled, it becomes water vapor, which is the white smoke that you see coming out, which is also water."

"Now, I'm going to ask you one more question."

"When water is boiled and turns into steam, it can knock the top of the iron pot into motion repeatedly, so how much power can it produce if it becomes larger and holds more water?"

There was silence.

All the students stared blankly at the lid that had been lifted up, still in the cycle of being lifted up and put down.

The cold wind was still howling, and the students stood in the wind, their faces and hands were blown red, but still none of them moved.

They were stunned.

I don't know how long it took.

The water in the pot no longer made a sound, the bottom of the pot appeared dark red, and the water was completely boiled.

Lu Heng pinched the lid of the pot with a handkerchief, and added a pot of water into it.

After doing all this, he looked at the students.

"I know this question may not be clear to you yet, but this is what the technical academy wants to teach you."

"Water vapor cannot be seen or touched, it can be collected and used."

"And I tell you, its strength is greater than that of cattle, sheep, horses, and other hard-working livestock, and even greater than an army of 100,000!"

"You are the first people to learn how to use this power!"

Some students looked confused.

It's normal, because the information they just received has completely refreshed their perception of the world.

Lu Heng smiled.

"I don't understand, do I?"

"Don't even believe that this so-called water vapor really exists, do you?"

"Come, I'll show you!"

He rummaged through the pile of blacksmith's belongings for a while and found a large alley.

Then, Lu Heng lifted the box.

It contained a set of things that none of the students had ever seen, but that didn't affect their knowledge.

It's a set of utensils made entirely of glass!

Lu Heng scooped boiling water out of the iron kettle with a long spoon and poured it into one of the parts.

He spoke, his hands moving.

"This thing is called a still, and the famous Zhenguan liquor outside is made from a still, but the one in the workshop doesn't look much like this."

"With it, I can prove to you that water vapor exists."

The students didn't speak, but they were shocked in their hearts at the same time—

How profitable Zhenguan wine is, everyone in Chang'an City knows it!

And this Teacher Lu actually taught this technique to himself casually......

also used such a precious object as glass to specially manufacture a teaching tool.

What a lot of money is this?!

When using these things, Lu Heng's hands and feet were as sharp as Foreman Chen, who was striking iron.

Soon he had assembled the still, and the slightly cooled water was still steaming.

An alcohol lamp made of high liquor is placed underneath and the water is boiled.

Not much.

The students watched as the water boiled and the condenser tube, which had been empty, appeared out of thin air and then flowed to the other side.

Lu Heng pointed to the distilled water that was slowly flowing out, and solemnly announced:

"See?"

"When the water is boiled, it doesn't decrease, but it evaporates into the air in this way."

"Once you know this principle, you can understand one thing."

"Water does have power."

"I'm going to teach you how to build a steam engine and let it drive a car weighing hundreds of thousands of pounds......"

"Within a few days, from Chang'an City, let this car run to the Western Regions!"