I make a popular science video and all the emperors learn from it!

[Popular science on the earth, the ten most precious natural resources!]

[Release completed, ...... are being delivered]

[Video maker, complete the rating.] 】

[Final results are being counted......]

[The results are as follows:]

[First place: Qin Dynasty Yingzheng, 95 points.] 】

[Second place: Li Shimin of the Tang Dynasty, 92 points.] 】

[Third place: Liu Che of the Han Dynasty, 91 points.] 】

[Fourth place: Zhu Yuanzhang of the Ming Dynasty, ~89 points.] 】

[Fifth place: Liu Bei of the Three Kingdoms, 8-6 points.] 】

【......】

[Reminder, credit-mall has been refreshed.] 】

Guozuo was rewarded with thirty pieces, which were immediately sold out as soon as they appeared.

At the same time, samples of steam engines were also on the shelves.

All the emperors were excited.

What they haven't been able to get out for a long time, they can finally hope to get it!

Although it's just a sample, who wouldn't draw a scoop according to the gourd?

I believe that it will not be long before the real thing can be made.

In addition, a number of technical drawings for shipbuilding were refreshed.

These sought-after goods, naturally, have no reason to give up.

[Popular science on the earth, the ten most precious natural resources!]

The earth is the home of our human beings. 】

The continuous progress of human civilization has accelerated the development and utilization of the earth's resources. 】

Nowadays, due to human activities, the earth's environment has undergone considerable changes, especially the exploitation of natural resources. 】

People are gradually realizing the importance of the natural environment to us and have taken many corresponding measures to protect it. 】

【...】

[Let's start the tenth place in popular science.] 】

[10th place: phosphorus!]

[Phosphorus, a non-metallic element of group 15 of the third period of the periodic table, element symbol P, atomic number 15, relative atomic mass 30.973762.] 】

[There are many allotropes of phosphorus, such as white phosphorus (or yellow phosphorus), red phosphorus, etc. 】

[White phosphorus has two forms, in the normal state, white phosphorus is a waxy white solid, and the purified white phosphorus is colorless and transparent. 】

[White phosphorus is insoluble in water, but soluble in carbon disulfide. 】

[White phosphorus will spontaneously ignite in the air to form P? O??； White phosphorus is converted to red phosphorus when exposed to sunlight or when isolated air is heated to 250. 】

[Red phosphorus will not spontaneously combust, and the danger is lower than that of white phosphorus. 】

[Red phosphorus is quite stable and can be sublimated at 1 standard atmosphere at 417.] 】

【......】

In addition, phosphorus is an essential element for life and is found in nerve tissue, bones, and cytoplasm. 】

[It is this knowledge about the human body. 】

[In ancient times, a terrifying synonym for ghost fire evolved. 】

["Ghost fire" has always been regarded as an ominous omen, a haunting phenomenon. 】

[However, modern scientific research has found that the so-called "ghost fire" is actually the flame emitted by the trace element phosphorus remaining in the body after human death. 】

[There have been many theories about the cause of the "ghost fire".] 】

[This dark flame always appears in the place of the dead, flickering and flickering, making people creepy. 】

[In "Strange Tales from Liaozhai", whenever it is mentioned in the wild deserted graves and mass graves, most of them will have traces of "ghost fire", like lanterns in the darkness, which can not only give people light, but also make people confuse their minds and go astray. 】

[In ancient literary works, descriptions of "ghost fire" often appear. (Read the violent novel, go to the Feilu Novel Network!)

[For example, Wang Yi of the Han Dynasty "Nine Thoughts of the Age of Mourning": "The divine light is shining, and the ghost fire is shining.] "】

[Song Dynasty Lu You's "Notes on Lao Xue'an" Volume 4: "When Yu was more than ten years old, he saw many ghost fires in the suburbs. "】

[Ghost fire has become a common thing to describe desolation and express the loneliness of the author's heart. 】

[However, idealism aside, ghost fire is only a phenomenon after all, and does not belong to the category of metaphysics. 】

[Modern science believes that the main components of the human body are carbon, hydrogen, and oxygen, in addition to phosphorus, sulfur, iron and other trace elements. 】

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[When a person dies and is buried in the ground, various chemical reactions will occur over time. 】

[The phosphorus in the body will be converted from the phosphate state to phosphine.] 】

[Phosphine is a gaseous substance, and the ignition point is particularly low, and it can be burned in direct contact with air at room temperature. 】

[This is also the reason why it is easier to see ghost fires in the wild during the hot summer months.] 】

[Phosphine will gradually penetrate beyond the surface of the earth along the cracks or holes in the ground, and after contact with the air, a chemical reaction will occur, and a dark yellow light will emerge, so it will become a "ghost fire". 】

[As for why the "ghost fire" chases people and "walks"?]

[Because phosphorus fire is very light, slightly less than the specific gravity of air.] 】

[At night, especially when there is no wind, if the air is still and does not move, it also remains relatively stable.] 】[]

[But if there is air flowing, the phosphorus fire will naturally float with the air, and even move forward or backward with people's steps.] 】

[When the person stops, because there is no force to drive the air, the ghost fire naturally stops. 】

[Why does the "ghost fire" shine and not heat?]

[Ghost fire belongs to "cold fire" and is pale yellow. 】

[Ghost fire is not the result of combustion, but chemiluminescence. 】

[What is released is not heat, only visible light.] To put it simply, it is bioluminescence, similar to the principle of fireflies. 】

[Why did the "Ghost Fire" suddenly disappear and appear in another location?]

In the natural environment, many objects generate a large amount of electric charge. 】

[Electromagnetic waves of different wavelengths are formed.] 】

[The ghost fire was fixed at first, and then suddenly disappeared and appeared in another position, which was affected by the interference of this fluctuation. 】

【......】