"Yo, the emperor is here. Who is this? Wang Yin greeted Li Shimin.

"This is the priest of the country, Dr. Kong Yingda Kong." Li Shimin introduced.

"Doctor? So hanging? Wang Yin muttered in his heart.

"Hmph, I thought it was who bewitched His Royal Highness King Wei, it turned out to be General Wang." Kong Yingda was dissatisfied.

"Uncle Kong, why is it so ugly to speak at an age, what kind of bewitchment?" Wang Yin asked.

Li Shimin held his forehead: Sure enough, this is very Wang Yin...

Qin Huaiyu is okay, Li Chengqian and Li Tai saw Wang Yin scolding Kong Yingda like this, they didn't dare to laugh, and they shook their shoulders straight...

I couldn't help but sigh in my heart: It's worthy of Brother Yin...

"You... Forget it, the old man doesn't care about these things with you. Kong Yingda glared at Wang Yin: "What kind of science did His Royal Highness King Wei say, but you taught him?" ”

"yes, what's wrong?" Wang Yin wondered.

"I just heard you say that the earth under our feet is a ball, and all of us live on a ball?" Kong Yingda flicked his sleeves: "It's just nonsense!" ”

Wang Yin pouted: "In the past, people on our side thought the same as you, thinking that the sky was round and the earth was round, but then there was a navigator who sailed in one direction, and it took three years, and finally the ship sailed to the place of departure, which proved that the earth is round." ”

"Nonsense." Kong Yingda insisted on his point of view.

"It's an interesting story." Li Shimin said a word, obviously he didn't believe it either.

Li Tai didn't speak, but his eyes were shining...

"For example," Wang Yin took out a boiled egg and put it on the table, "which of you can put him on the table." ”

Everyone tried it one after another, but finally gave up.

"It's impossible." Kong Yingda said with a blowing beard.

"Smack!" Wang Yin took the egg and slammed it on the table, and the egg stood firmly on the table.

"If you don't know, it doesn't mean that he doesn't exist, many times if you look at the problem and change the angle, you can solve it." Wang Yin said lightly.

At the same time, I thought in my heart: This force, I give myself 86 points!

"If, as you say, we are on the same ball, wouldn't the person on the other side fall off?" Kong Yingda said with a stiff neck.

"This brings us to another term, gravity."

"What is gravity?" Kong Yingda continued to ask.

"Gravity, also known as gravitational force, is the tendency of objects to accelerate closer together." Wang Yin read according to the search results: "The attraction of the earth causes nearby objects to fall to the ground. Gravitation is the reason for the existence of galaxies such as the Solar System。。。。。。 ”

"What is the solar system? What is a celestial body? What is Tide? Kong Yingda asked dizzily.

I'm rubbing.,Uncle.,Your problem is out of line.。。。

"Ahem, it's too early to talk about this, let's talk about the basics." Wang Yin hurriedly used Dafa to change the topic to cover up his ignorance.

"When we talk about gravity, we have to mention buoyancy." Wang Yin regained the demeanor of the old god: "To take the simplest example, the boat can float on the water, which is caused by buoyancy. ”

Wang Yin's explanation was easy to understand, and everyone nodded thoughtfully.

"In fact, there is buoyancy not only in the water, but also in the air." Mr. Wang is online again.

"What is air?" Kong Yingda didn't care about finding fault with Wang Yin, and was completely attracted by Wang Yin's topic at the moment.

"The air is all around us, we just can't see it. Normally, all we breathe is air. Wang Yin said.

Seeing everyone's confused looks, Wang Yin decided to do another small experiment.

Wang Yin took out a glass water tank, asked Qin Huaiyu to add more than half a tank of water to it, then took out a glass glass, tore off a piece of paper from the notebook and stuck it at the bottom of the cup, and then turned the cup upside down and pressed it vertically to the bottom of the water, and the water surface directly covered the bottom of the cup.

"What do you think of the paper at the bottom of the cup?" Teacher Wang looked at the crowd and asked.

"Naturally, it's wet." The crowd had a very simple look on their faces.

"Really?" Wang Yin took out the cup vertically, took out the piece of paper stuck in it and handed it to them: "Touch it yourself." ”

"It's not wet?" Li Shimin was surprised after touching it.

The remaining four took turns touching it, and they were all shocked.

"This cup looks like there's nothing in it, but it's actually filled with air." Wang Yin shook the cup in his hand and said, "Let's continue to see." ”

Wang Yin pressed the cup vertically into the bottom of the tank again, and then tilted the mouth of the cup slightly.

A bubble immediately popped up from the mouth of the cup.

"As you can see, this bubble is air." Teacher Wang explained.

"It's amazing, we're all around us with this thing called air." Everyone couldn't help but sigh.

"Yes, air is closely related to us, and what we usually breathe is oxygen in the air." Teacher Wang continued: "For example, if a person's nose and mouth are blocked, then the person will suffocate to death, which is caused by the fact that he cannot breathe oxygen. ”

As soon as Wang Yin said this, everyone suddenly realized.

In the past, I only knew that people would suffocate, but now we know the cause of suffocation.

It turned out that I couldn't breathe oxygen.

"Usually you cook and make fires, and you also use oxygen, and if there is no oxygen, the flame will be extinguished very quickly." Wang Yin continued, and then casually poured the water from the glass water tank to the ground.

"Let's do a test, and you'll be saved." Wang Yin took out the alcohol lamp and lit it: "You see, now this lamp can burn normally. ”

Everyone nodded subconsciously.

Then Wang Yin put the glass water tank upside down on the alcohol lamp, and at first there was no change, but after a while, the flames became smaller and smaller at a visible speed until they were extinguished.

"I understand, it's the fire that burns out the oxygen in it, and the fire goes out without oxygen." Li Tai was the first to react.

Wang Yin had to sigh: He is worthy of being a scholar, he is a cow!

Everyone suddenly realized and nodded.

"But, Brother Yin, weren't we talking about buoyancy just now?" Li Tai suddenly mended the knife.

"Ahem. I introduce air to give you a better understanding of buoyancy. Wang Yin hurriedly coughed to hide his embarrassment.

Made, accidentally went off track。。。。。。

"Now that you know that air exists, it's relatively easy to explain buoyancy." Teacher Wang continued: "A very light thing, such as a feather, will slowly descend in the air, instead of falling all at once, it is caused by buoyancy. ”

"Why can birds fly but people can't?" Li Xueba asked again: "Is it also because of this buoyancy?" ”

"Hmm... Wang Yin touched his chin and pretended to organize the wording, and quickly opened the search and checked it.

Made,The most annoying thing about Xueba Shenma.,I feel like I'm about to be unable to hold it.。。。

"This is caused by many reasons, and this knowledge is not clear to you in a short time, but you will know it when you learn it later." Wang Yin looked at the search answers and didn't bother to read them.

The ghost knows what heart-wrenching questions he will ask after finishing his studies...

"Ahem, although we humans can't fly by ourselves, we can use external forces." Wang Yin quickly changed the topic: "Learning and using tools is our human strength. ”

"You mean, we can fly with the help of external forces?" Li Shimin immediately grasped the key point.

"Yes." Wang Yin nodded.

"How?" Li Shimin hurriedly asked.

The others also looked at Wang Yin expectantly.

Flying has always been the dream of human beings for thousands of years, and now when they heard that they could fly, several people were immediately extremely excited.

Wang Yin searched in the mall, and after a while, he found what he wanted.

Hot air balloon: 100 pieces/piece (limited to 4 people)

That's you!