"In this world, nothing is eternal, water can turn into water vapor and freeze, stones can be weathered into dust, metal can become liquid at a high enough temperature, and nothing is eternal under changing conditions. Ren Baqian stood on the stage and spoke to everyone.

Everyone below listened honestly, although they all looked a little older and stronger, which was different from ordinary primary schools in remote mountainous areas. But the essence is the same, Ren Baqian has learned to ignore the surface and look at the essence.

At least yes in this matter.

Ren Baqian has already begun to consider whether to customize school uniforms for them.

There is also a red scarf and a bar, two bars, and three bars.

However, Ren Baqian felt that he could change it to one knife and two knives...... All the way up to nine knives.

After a period of time, everyone was familiar with this new life and new identity.

And was a little bit interested.

After all, many of the things Ren Baqian talked about were unheard of, and he hadn't even thought about it.

Some of the content is acceptable to everyone, and some are difficult to accept, such as Ren Baqian's words just now, someone immediately raised his hand to ask.

Ren Baqian was very satisfied, although it was not a long time, but under the care of his own gun, these bear children finally learned to raise their hands and ask questions.

The gauze on several students is the price of love.

It cannot be ruled out that two of them were injured by mistake, but these details do not need to be too concerned.

"You say!" Ren Baqian made of a piece of pure iron, and the finger-thick whip pointed at a young man below.

"The heroic souls of our ancestors are eternal, and they have always watched over us. The boy suddenly said loudly.

Ren Baqian tilted his head to look at him, his gaze made him a little cramped, and he was also vigilant in his heart.

"That's right. There are still some things in this world that people can't explore, including the heroic souls of our ancestors. So now what I teach is the basic building blocks of the world, the things that have been discovered, and the things that are not yet known are to be handed over to you.

Science is to stand on the shoulders of those who came before us to constantly discover the unknown, not to deny the unknown, and I hope you will remember this. Ren Baqian smiled calmly.

He does not deny the existence of those heroic spirits, just as the earth cannot deny the existence of ghosts, these are unknown things, which have not been discovered at present, but it does not mean that they do not exist.

Just like the reason for the crossing has not been found yet, it does not mean that there is none, it can only mean that he has not found it yet.

Ren Baqian's calm smile made many students breathe a sigh of relief, and their hearts were also a little happy.

This is a rare affirmation for Ren Baqian.

Little Lori Tonglan leaned on her chin with one hand, grinning, and laughing at the stupid people around her.

"The world is made up of molecules, atoms, and ions, which are the basis of the world. These molecules, yards, and ions that are invisible to the naked eye make up all the substances in this world. ”

"Teacher, since we can't see it, how can we know that what you say is true?"

"You can't see molecules with an optical microscope, you need an electron microscope. If the conditions are right in the future, I will get you a set. There are many other ways to verify this, and I will tell you about it later. Ren Baqian said lightly.

Immediately, someone asked what an optical microscope and an electron microscope were, and Ren Baqian simply answered these questions.

Usually the situation in physics class is not bad, and Ren Baqian is usually in a good mood.

So physics classes are all in the first period.

"Today let's do an experiment on the structural transformation of water. The first point is that under normal atmospheric pressure, water can reach its boiling point at 100 degrees Celsius and be converted from water to water vapor......" Ren Baqian talked eloquently as he put the small pot, the alcohol stove, and the thermometer on the lectern.

"Come, let's see, now the thermometer has reached 80 degrees, and 100 degrees is the boiling point of water......" Ren Baqian said as everyone looked at it.

Although everyone knows that water vapor occurs when water is boiled, this is the first time that such a formal test has been conducted, and many people are very interested.

Then the crowd watched as the water temperature exceeded 100, 101, 102, 103...... 110......

"Well, it has now been proven that water is the boiling point at 110 degrees at the usual atmospheric pressure, which is converted into gas. And at this air pressure, the temperature of the water will also be maintained at 110 degrees. Ren Baqian extinguished the alcohol lamp and threw the pot out of the window by the way.

"Teacher, you just said 100 degrees. Little Lori Tonglan's face was bright.

"The air pressure is not constant, it varies from region to region, and usually the higher the place, the lower the air pressure. It's 110 degrees here now. You just have to remember that the air pressure is high, the boiling point is high, and the air pressure is low, and the boiling point is low. "Ren Baqian discovered for the first time that the air pressure in this world is actually different from that of the earth.

This also reminded him again, although he didn't feel too different, but this world is another world after all, and many places are still different from the earth.

If you want the world to develop technology, you have to verify everything a little bit.

Otherwise, I can't tell when I will be slapped in the face again.

Next, he used saltpeter to turn the water into ice in front of everyone's eyes, which surprised everyone and immediately thought of the shaved ice that is now sold outside.

This lesson talks about these two morphological changes in water.

When class was about to end, Ren Baqian asked people to go to the next room to bring the textbooks he brought back and distribute them to everyone.

"Teacher, what is this?"

"Your future study materials are from my country. "Ren Baqian is not a Dayao person, this is what everyone knows. However, few people really know what country Ren Baqian is from.

"I come from a country far away, so far away that you will never be able to reach it in your lifetime. Our country is very different from here, in our country people prefer to study the nature of the world, and it seems to us that the level of knowledge of the world will become our own strength, to do things that we could not do before......"

"For example, a machine that can run faster than a galloping horse, a device that can fly in the air, a device that can lift 100,000 catties or a million catties of objects......"

Ren Baqian is also the first time to calmly tell someone other than the empress about the earth.

Before, I was afraid that people would know that they had a lot of good things in their hands and beat their own ideas, so I didn't dare to say more. But with the change of identity and status, he no longer needs to worry about this, and naturally there is no need to hide it. What's more, he has already exposed a lot of things.

Rather than let them guess, take this opportunity to briefly talk about it yourself.

There's nothing to hide and hide.

It's better than letting them guess whether they are from Great Xia or Yunguo.

"Teacher, what is this thing?" someone asked, pointing to a picture of a physics book that had just been opened. "Is that the instrument you were talking about?"

"It's a high-speed train, which can run more than 1,200 miles in an hour, and there is no need to rest. What would have taken a few days to reach can be reached in just one or two hours.

If there is this in Dayao, it will only take two hours to get from here to Heicheng, and if anything happens, it will only take two hours for our army to reach Heicheng.

Ren Baqian's words made everyone look surprised.

You must know that from Lancheng to Pingcheng, it takes half a month for the carriage to travel, and it also takes three to four days to speed up the horse.

If there is another war, with this thing, it can be said that it can be supported at any time, and the battle report can be transmitted back at any time, which is too valuable.

Most of the people here are second-generation officials, even if the talent is not high, even if they are a little reckless, but this thing can still be imagined.

"If you want to build high-speed rail, you need a lot of things. I can teach you that it's up to you when you can build it. Ren Baqian smiled.

He loved seeing the excitement and anticipation on the faces of these students, and it was very rewarding.

Then he told the students something else, and the students all widened their eyes as if they were listening to a book from heaven.

Tonglan and Shi Dang stopped wandering and listened intently.

But it didn't last long.

In the second class, Ren Baqian's roar sounded again.

And in math class, gunshots rang out directly.

"Let the people from the Physician's Bureau come!" said loudly to Xu Wei with the green tendons in Ren Baqianyi's head. "Let them send someone to stay here and be the school doctor......"