I am the cook, but I am Li Er's son-in-law

Seeing that it was still turning slightly, several little girls sent someone to hold up the shield to extinguish the firewood below, and wait until the little ball above stopped turning completely.

They walked forward with confidence, and Li Lizhi picked up a branch and poked it cautiously.

The little ball spun around for a while, but there was no movement again.

They also sent someone to open the lid of the pot underneath. It was pitch black inside, and the water had boiled dry.

At this point, the little girls are not so stupid that they don't see the "why".

vapor.

The power that makes the ball spin wildly comes from water vapor.

But why is something as inconspicuous as water vapor able to achieve this level?Several little girls studied it all night, and tentatively figured out the principle.

During the boiling process of water, a large amount of water vapor is released, and the internal and external air pressure is unbalanced, and then this small device is used to convert the energy of the steam into kinetic energy.

This principle is basically no different from gunpowder.

But... gunpowder can be used to make fireworks and artillery, what can this thing be used for?The little girls didn't figure it out.

Is it also used as a weapon?But it's not too troublesome, and it basically doesn't hurt if you don't get close.

The next day, the little girls rushed to the restaurant with thick black eyelids.

This interesting thing almost made it difficult for them to fall asleep all night.

After breakfast.

Li Lizhi couldn't wait to ask: "Brother Zhengyang, what is the use of this thing?" She reached out and pointed to the device on the corner of the table, and pulled it honestly.

"It's useless." Yin Xuan took a mouthful of noodles and said confidently.

The little girls were taken aback.

Yin Xuan nodded: "I didn't lie to you, this thing is really useless at all, it's too much of a hindrance if it's just a decoration."

"Then what brother Zhengyang is going to teach us today is related to this gadget?" Li Shu thought about it and remembered what Yin Xuan said yesterday.

Yin Xuan nodded, took another mouthful of noodles, and waited for the food in his mouth to swallow: "Occasionally, I will tell you about industry and science."

"Have you ever thought about what is important for our human social production?"

The little girls were stunned and fell into deep thought.

what is the most important
"Explore the unknown." Li Shu quickly gave an answer.

Yin Xuan pinched her face: "It's a very clever answer, but it's wrong. I mean it is for human social production, not human society."

Fang Yiyu rolled her eyes: "Money, or resources?"

Yin Xuan was a little surprised, and pinched her face: "This is also a very smart answer, and it is correct, but it is not the answer I want now."

Li Lizhi and eldest grandson fell silent, holding their breath.

Both sisters gave their answers, and they were praised as smart answers. They had to work hard not to give too bad answers.

But they were dismayed to find out.

The most suitable answer has already been given by Fang Yiyu, and the other things they thought of are not very suitable, and they are all small items under the general category of "resources".

Yin Xuan snorted and drank the noodle soup, exhaled, and then said: "Actually, human social production is industry."

"At this stage, the most important thing is actually to boil the water."

The little girls were taken aback.

The guests who were eating breakfast and eavesdropping were also taken aback.

Yin Xuan didn't hide this very important thing from them, just said it openly in the restaurant lobby, how could they not be interested.

But this answer is too surprising. What does the development of human society have to do with boiling water?
Thousands of years ago, their ancestors knew how to make this thing, but from Zhou to today's Tang, there has been no change driven by such a mere "boiling water".

Even the hut has more presence than boiling water.

A generation of hero Jin Jinggong fell into the hut and drowned.

"It... has something to do with it?" None of the little girls could react, Fang Yiyu hesitated to speak, because she realized that boiling water might be different from what she had taken for granted before.

But...is it a bit exaggerated to hang this thing on "human social production".

Yin Xuan pushed the bowl, and Zhao Yue came over to clear the table.

Human society is actually related to water.

If you know how to drink boiled water, you will know how to use fire.

After understanding the beauty of steam, we will start to develop water heating in an all-round way. Power generation is water heating, and the first trains and automobiles are also powered by water heating.

Even the initial use of nuclear energy involves boiling water.

Human beings start with boiling water and learn more abilities step by step.

Yin Xuan didn't explain this to these little girls, but raised his hand, and carried the steam ball, which weighed more than ten kilograms, to the table.He flipped the ball casually.

"Have you ever thought about installing this thing on the carriage?" Yin Xuan asked casually.

The little girls were just about to deny it.

How could the carriage carry this thing? It's too bulky, and what's the use of carrying this thing?
But a little inspiration was born in their minds. The spinning ball reminded them of wheels, and then of installation...

If the two ends of the ball are connected to wheels, then there is no need for a horse-drawn cart, and then the carriage is full of white steam, bumping and running forward at a fast speed.

Thinking of this, the little girls couldn't help laughing.

The diners who eavesdropped on the side felt baffled. Is it a funny thing to install this thing on the carriage?Why are they all smiling so happily.

Seeing that they all understood what they meant.

Yin Xuan continued: "Of course, this thing can't be used directly on the carriage. It needs to be improved. As for how to improve it, it's up to you."

"It's an interesting subject, isn't it?"

The little girls nodded their heads, their eyes sparkling and full of anticipation.

Yin Xuan changed his mouth and asked again: "By the way, do you still remember the frictional electricity I told you before?"

The little girls nodded.

Yin Xuan once said that they would never forget such an interesting thing.

"When you figure out the steam engine, you can also consider using this thing to generate electricity."

Power generation?

The little girls nodded noncommittally. They haven't realized how amazing electricity is, and their impression of it is still dangerous.

Yin Xuan glanced at the eavesdroppers.

He ordered again, and ran the steam ball again at the entrance of the restaurant.

Even in the near future, I will write about this thing again in a magazine.

The steam engine is different from other things. For today's era, it is considered an extremely sophisticated machine. Everything starts from scratch. It is not the era when anyone with a little knowledge can rub the steam engine by hand.