The success of the artificial rainfall experiment undoubtedly gave the aristocratic scholars of the Tang Dynasty a certain understanding of the formation of the natural world.

And this time, the article also lists all kinds of evidence in detail, including air temperature, humidity and so on.

Temperature can be measured with a thermometer, in fact, with Datang's current technology, it is not difficult to make a thermometer, the difficulty is only how to choose a constant temperature, and then use this as a standard to carve out the scale.

As for the hygrometer, Li Chong's wet and dry bulb method is to use two thermometers, one of which does nothing to deal with, and the other thermometer is wrapped in gauze dipped in water.

I won't say much about the specific principle.

Anyway......

The Academy of Sciences has gradually been able to quantify something.

The reason why they thought that the artificial rainfall experiment was likely to succeed was that after a large number of measurements, they found that the air humidity had changed relatively significantly compared to before.

That is, before they sprinkled salt, and there was no noticeable change.

And this time, they also sprinkled salt, but there was a noticeable change.

In other words, their act of sprinkling salt must have had some effect on the rainfall.

And at the end of the article, it also points out the reason for such a different phenomenon.

Probably because Yizhou is in the south, and previously, most of the locations of their experiments were chosen in the north.

In fact, anyone who has ever flown in a hot air balloon will know that the air in the south is very different from the air in the north.

The air in the north is relatively dry and cold, while the air in the south is more humid and warm.

Other words......

In a warm and humid environment, salt is more advantageous as a condensation nucleus.

After reading this article, even Li Chong couldn't help but feel that this fucking seemed to make sense.

Li Chong also expressed his opinion.

Rainfall in the south, indeed, should be determined by condensation nuclei, by gravity.

The rain in the north may be to condense ice crystals first, and then wait for the ice crystals to fall from the sky, and then melt into small water droplets after being warmed halfway, which is the correct way to open artificial rainfall in the northern region.

Other words......

Rainfall in the north may not be salt, but requires a substance that can absorb heat so much that water vapor can condense into large ice crystals.

Now everyone finally knows why the previous rains have failed.

To put it bluntly, the direction was originally wrong.

As for what you're going to say, what can cool down the surroundings quickly.

Then Li Chong could only say that he didn't know either.

A: Maybe you can find it from here.

Now, Datang's scientific and technological development has basically developed to a bottleneck, and if this chemistry does not get a better breakthrough, it will be difficult for them to have any greater gains.

To this end......

Li Chong also brought in those who were good at alchemy, don't listen to their foolishness, talking nonsense, saying that they can refine the elixir of life.

Li Chong's focus is on the very pure and pure substances that they can refine or dig up in nature.

….

For example......

Those colorful ores.

"Do you want to be a Taoist priest? Do you want to learn other people's alchemy?"

Xincheng was hugged by Li Chong, and she naturally didn't have much interest in this.

Li Chong said, "Alchemy and the pursuit of immortality are just saying that to the outside world, and I am actually studying chemistry."

"What is chemistry?"

Li Chong: "You don't understand it, but to put it simply, it is from one thing to another, and this is chemistry."

Xincheng only felt unfathomable, "Then you can refine the elixir that makes people immortal?"

Li Chong: "In this world, there is no such medicine.

But it's okay to refine gold and silver. Look, it's all written here how to make gold and silver."

If Li Chong hadn't been teasing her, she wouldn't have been so bored with Li Chong to read this kind of completely incomprehensible book.

It didn't take a few days.

Li Zhong soon extracted an acid from a green crystal.

The Taoist priests and alchemists of the Tang Dynasty all called this kind of alum, and through the distillation of the alum, the solution obtained was called 'alum oil,'.

But Li Chong knew that this thing should be a kind of acid!

Because this thing really seems to be very corrosive to metal.

Other than that......

When it was boiled and all the water in it was steamed, it really looked like the concentrated sulfuric acid he had learned.

In some nature.

Of course!

To tell the truth, Li Chong is not too sure.

Until all kinds of experiments are done, all kinds of evidence point to it, this thing is concentrated sulfuric acid, however, Li Chong is only 30% sure at most.

After all......

He was actually a very conservative and steady person.

But regardless of whether this thing is concentrated sulfuric acid or not, one thing is certain, he may be able to use this thing as a battery.

Let's default it to an iron sulfate solution.

And the ghost remembers what color the iron sulfate solution was.

Li Zhong intends to completely discard the description of these things by the ancients, and then make up a method of description himself.

It is mainly from the attitude of seeking truth from facts, how it is, for example, from the color, water absorption, the consistency of the liquid, the smell, the corrosiveness, the volatility, etc., to describe a thing objectively, rather than being nervous like the ancients.

Other than that......

It is to combine it with what you already know, for example, take this suspected concentrated sulfuric acid and react with other solutions that you already know.

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See if you can generate a precipitate.

To tell the truth, this sulfate will react with something to precipitate, and this Li Chong really can't remember it all at once.

But......

He vaguely remembered that when he used to do experimental problems, it seemed that he should have done it.

At last......

I can only recite the first twenty of the periodic table, and then I find that they don't seem to be quite alike.

In ancient times, it was actually difficult to engage in chemistry, and there were too many differences between this ancient book and the textbooks of later generations.

Shortcuts are definitely not going to be taken.

So what to do?

can only be down-to-earth step by step, taking the road that predecessors have walked.

In fact, Li Chong, this is already good.

At least!

He still has a little bit of foundation, as if he is doing those chemical fill-in-the-blank questions, although he doesn't know the specific chemical reaction, but he can know half of them through a little hint, so as to deduce what the newly produced substance is.

Finally, after some research by Li Chong.

He seemed to have made another acid.

And if he didn't guess wrong, this should be dilute hydrochloric acid.

Because it smells really pungent.

Pendulum rotten 11