In the autumn of Lanzhou City, the blue sky is like washing, and the sky is high and cloudy. The city built on the Loess Plateau is within reach of the clear blue sky, and the city lines separated by the horse route wrap the Holy Heaven Middle School in a clear layer, and the van with strange equipment on the top of the branches of the lines is scattered and spread according to the large-scale coordinates, looking at the Holy Heaven Middle School reflecting light particles in a circle.

Gan Yi stepped down from one of the vans, and several team members played with a golden egg-like object in front of them, and Gan Yi stepped forward and looked at the golden egg fixedly.

The whole body is rounded, spiral shrinkage from top to bottom, and the upper edge is arranged in a circular pattern with inscription codes.

A member of the team got out of the car, handed Gan Yi a test sheet, and after scanning it, Gan Yi got into the car, and the black dot in the city line drove towards Holy Heaven.

Dressed in basketball uniforms and steaming all over their bodies, ** Qiang and Chen Fei withdrew from the basketball court, came to the sidelines, and took the functional drink handed over by Gan Yi.

"Mr. Gan, you're so polite!" After Chen Fei finished speaking, he drank it all.

"That's it, Mr. Gan, isn't it in the third season, the funding of your non-existent department has increased!" **After saying it, drink it all.

"This is mainly due to the strong leadership of the department heads, the right governance."

"Oh, isn't it, but aren't you the head of your department?" **Strong asked knowingly.

Gan Yi pushed his glasses, which was self-explanatory.

"Gan is strong!" Chen Fei gave a thumbs up.

"Gan is right!" Strong thumbs up.

Gan Yi smiled smugly for more than ten seconds. "How about it, what new ideas have you been thinking lately?" ”

Zhang and Chen glanced at each other and motioned for Gan Yi to say as he walked.

Three figures stroll along the Boulevard of Sant'Paradise during the cleaning.

"I've been meeting a girl lately, and it feels very familiar, but all the memories of her are like a dream!" Chen Fei's face was solemn.

"Crooked day, the girl in your spring dream? You sleep at night, **can't wear too tight! "**Strong fun.

"What happened?" Gan Yi asked.

"She seems to have told me something, but you know my brain, I don't remember it." Chen Fei's gaze drifted away for a while.

"But there is one scene that I remember very well, she has been standing in front of the pole hut, which seems to have a deep meaning."

"I don't understand, did you meet in a dream or in reality?" Gan Yi was puzzled.

"I can't tell the difference, so I feel weird!" Chen Fei looked dazed.

"What is the Pole Hut?" Gan Yi asked.

"You can start making up for it yourself from the third episode of the first season."

Gan Yi pondered for a while and asked ** Qiang, "What is your situation?" ”

"Me? I've recently felt that our physics teacher wasn't a good fit. ”

"Tell me!"

"I just don't think I know the current physics teacher, the current physics teacher has been teaching us since the beginning of school, but I think he seems to have appeared suddenly, there was definitely a physics teacher before him, but that's what, if the dream is left without a trace!"

Gan Yi didn't speak, was silent for a while, and took out the golden egg from his pocket.

"Crooked sun, golden?" Chen, Zhang's eyes lit up, and they were about to reach out and touch them.

Gan Yi let the two of them catch him and play for a long time.

"Do you know?"

"Know, know, Golden Egg, who doesn't know!"

"I'd like to ask if you've seen this strange thing, anywhere, anywhere."

"I've seen gold bars on TV, but it's the first time I've seen them in reality!"

"This thing doesn't belong to modern times."

"What do you mean, under the gold standard monetary system, gold retains its value for ten thousand years!" **Strong incomprehensible.

"You're right, 10,000 years of value preservation, this golden egg comes from 10,000 years later!" Gan Yi's face was solemn.

Chen and Zhang looked at each other for a while.

"Mr. Gan, are you saying that you found a golden egg after 10,000 years, that is, this golden egg has traveled from 10,000 years later to modern times?"

"Yes."

"Modern times are not late Ming Dynasty, late Qing Dynasty, what is it doing when it travels over?"

"Let's look at it, the golden egg." Gan Yi took the golden egg.

"This smelting process, this polishing level, 200 percent is artificial." Gan Yi pointed at the golden egg.

"That is, in 10,000 years, our descendants will give us red envelopes!" **Strong conclusion.

"Mr. Gan, this golden egg is as new as ever, why can't I see that this egg is something 10,000 years later?" Chen Fei was puzzled.

"We have determined the age of the charcoal 14 test."

"Mr. Gan, ask this, although there is a suspicion of making up the number of words, but what is carbon 14?" Strong questioning.

Carbon 14 dating is radiocarbon dating, and for the dating of organisms, in addition to stratigraphic dating, carbon 14 dating is often used in paleontology.

Is the carbon 14 dating an American Verard? Frank? Libby discovered it, for which he won the Nobel Prize in Chemistry in 1960.

The principle of carbon 14 dating method is: when the organism is alive, it will continuously ingest carbon 14 from the outside world due to respiration, eating, etc., and finally the ratio of carbon 14 to carbon 12 in the body will reach the same as the environment (the ratio is basically unchanged), when the organism dies, the intake of carbon 14 stops, and then the ratio of carbon 14 to carbon 12 in the body changes due to the decay of carbon 14 in the body, and the age of death of the organism can be determined by measuring the ratio of carbon 14 to carbon 12.

However, due to the relatively short half-life of carbon 14, the application of carbon 14 dating is limited to 5 to 60,000 years.

"Then it is impossible to go wrong in 10,000 years!" Strong representation.

"Mr. Gan, what is your idea?" Chen Fei asked.

"Do you know where this golden egg came from?" Gan Yi asked rhetorically.

"It must be near Holy Heaven, otherwise you wouldn't have come to us!"

"I think this is a message sent to us by people ten thousand years later, since it was found near the Holy Heaven, it must have something to do with you."

"We are innocent, go to school according to the law, and do not hand in homework!"

"I'm going to set up a work in the Holy Heaven, study the golden eggs here, and if you have any new discoveries, feel free to come to me!"

The bell rings for the evening self-study.

Zhang and Chen took their leave.

In the self-study class, ** asked Chen Fei, "Tell me about the girl in your dream, what is the glamorous scene?" ”

Chen Fei was silent for a while.

The girl was tall, ponytailed, imposing, and seemed to keep saying "Have you forgotten me?" And I said something that I didn't have, I can't remember anyway, and then she beckoned to me in front of the pole hut, against the sun, the skirt was flowing, and then, my heart hurt and I was very lost."

"You soaked that girl and kicked people again, and people used their dreams to scare you, a negative man." Strong dismissive.

"Seventeen years of dust, I, Chen Fei, am not that kind of person."

"You don't know that girl at all?"

"It's very familiar, it's familiar, but I can't remember who it is!"

The two of them were silent, letting the fluorescent lamps above their heads hum.

"What's the matter with the physics teacher you're talking about?"

"Our current physics teacher wears gold-rimmed glasses, and he can't pull a few, and he has a weak air of weakness, called Younanshan, right?"

"That's right, I always like to talk to us about time travel and space wormholes before every class."

"The physics teacher I remember is not him, he is a bearded, obscene-looking, weird uncle, and I must have had some other story with him."

"If something really happened to you and your uncle, it's not a story or an accident!"

"You've seen too much, Uncle gives me the feeling of sacrifice and dedication, I believe that in our story he sacrificed in the end."

The two were silent and let the school bell ring.

"Come back, no clue!"

"Let's fight the darkness and go, push Memphhisto!"

"Let's go!"

School the next day.

**Qiang saw that the school had set aside a large conference room for Gan Yi's relevant departments, and a group of people were busy in it, drawing drawings and fiddling with equipment. It's in full swing and it's very lively.

In the third physics class, Mr. You Nanshan walked in.

** Qiang immediately raised his hand and asked. "Teacher, you say, is it possible for people from the future to travel to the present?"

Yo Namsan's gaze could not be seen in the mist under Phnom Penh's glasses.

It's all a matter of time directionality, because Newton's equation of mechanics says "Time is reversible." So physicists developed the belief that time has no direction at the fundamental level of matter. This idea can now be popularly described in movies. If a film about the collision of atoms is played forward or backwards, we don't see the difference.

In the atomic world, time has no preferred direction. The reversibility of time also holds true for the equation of quantum mechanics. In fact, the principle of reversibility has survived several revolutions in physics, and it is a firmly established concept.

So, suppose a person from the future adjusts the direction of time, and he has no problem coming to the present. ”

**Strong, Chen Fei buried himself in notes wildly.

You Nanshan's eyes jumped, and he pressed the expression of questioning, but did not speak.

After school, the two came to Gan Yi's reception room and told him that our physics teacher said that it was theoretically true that people in the future would come to the present.

Gan Yi looked at the hand-copied notes of the two and pushed his glasses.

"The high school physics teachers are scum, they are nothing more than a baby with fingers in diapers in their profound majors, and the reprocessing of basic terms built on the art of science fiction constitutes a pastime to fool you between classes every day."

"Exaggeration, Mischief!"

**Strong, Chen Fei and the others looked at Gan Yi's disdainful expression and looked at each other.

"He spoke of reversibility, proving that he was a big fan of reductionism!"

"What is reductionism?" ** Strong head scratching.

"From the times of Galileo, Kepler, Descartes and Newton, the scientific spirit and its suppression of humanity from time immemorial to the unknown prevailed. Newton's laws of celestial mechanics and Descartes' coordinate system, which allowed scientists to view the universe as a vast grid, seemed to show that anything could be described by mathematics and mechanics.

By the time of that little man Napoleon, Pierre of the First French Empire. Laplace seems plausible in imagining that one day scientists will come up with a powerful mathematical equation that will explain everything, and chaos will be imprisoned and forced to reflect the posture of universal order.

Reductionism is essentially a watchmaker's view of nature. A clock can be broken down into its components: cogs, escapement, springs and gears. It can also be assembled with these parts. Reductionism assumes that nature can also be assembled and disassembled.

Reductionists believe that the most complex systems are also composed of springs, cogs, escapement rods, atoms, and subatomic equivalents, which are combined by nature in an infinitely delicate way.

Reductionism implies that in Laplace's universal formula of dreams, this is a deceptive idea. All confusion is better to die, so in the end it is just Newton's laws.

In science, a phenomenon is ordered if it can be explained by a causal model represented by differential equations.

Newton first introduced the idea of differentiation, in his famous laws of motion, linking the rate of change to various forces.

Scientists soon became trusting linear differential equations. No matter how different phenomena may be, such as the flight of cannonballs, the growth of plants, the burning of coal, and the operation of machines, they can be described by these equations, where small changes produce small effects, and large effects can be obtained by adding up many small changes.

Thus, at the end of the 19th century, the belief in reductionism and mechanism was still prevalent. Gan Yi spoke at the entry on his laptop.

"Oh! Got it, Mr. Gan, don't you eat at noon? Chen Fei rubbed his eyes.

Gan Yi smiled and motioned to his subordinates to bring two boxed lunches to the two. watched the two of them feast on the wolf. You opened her mouth leisurely, "Do you two feel that what is happening now is very much like time has been reset?" ”

"The reset you said is the same as restarting the computer, Mr. Gan, give me another box of chicken leg rice?" Strong gaze craves.

It seems that the funds have really increased, and the lunch box has been enough for the two of them.

"That's pretty much what it means, but after restarting, your game scene has changed, and the people and things in it are very likely to have very small changes, and if you don't pay attention, you probably won't find it."

"Why was it reset?"

"The sum of a series of events, what happened, hope was covered up, so the time was reset!"

"You mean there's a trick behind it?"

"It must be so."

"Who's so awesome?"

"I'd love to know, too."

After eating the box lunch, Qiang wanted to go out and brush up on Memphisto again.

Chen Fei was not interested, and walked alone to the pole hut.

The bright autumn sun still warms me, that distant and endless fantasy.

Chen Fei thought of the most familiar stranger, it seemed that he had been willing to give his life for her a long, long time ago, such a person can be forgotten by himself, memory is so easy to be extracted, so what kind of clouds and sunny days, joys and sorrows and sorrows can be easily solved?

If you survive or die, forget to be proud!

In the physics class the next day, the clear-headed ** Qiang once again asked, "Teacher Younanshan, is it possible that there will be such a thing as time reset?" ”

Younanshan carefully observed ** Qiang and Chen Fei, with a crisp sound of "pop". The chalk in his hand was broken.

"Quite possibly!" Younanshan's grim face opened.

"The study of human cognitive consciousness shows that the human mind is not only internal dimensional, but divergent. The brain exists in living organisms, but it operates according to the theory of the quantum plane. ”

"Physical experiments have shown that quantum, the consciousness of existence, and the reality of existence can affect the brain's thinking. It's amazing, but what's even more incredible is how much the brain can influence quantum and the information it carries. ”

"In fact, the universe transmits information to the brain, and the brain feeds back information to reality, all of which are influencing this multidimensional world in an invisible way."

"The brain binds its mind to this universe, and once an accident happens and breaks this close connection, the brain will accept the new reality and be closely connected to this new universe again. Some people can recall fragments of past reality, but others can't. ”

"It's a leap of thought, not a time shift or a time shuttle. This is the cosmic migration with quantum entanglement. ”

"You mean, the universe is the main host, and as long as you send a command, it can be restarted?" Chen Fei asked.

You Nanshan carefully looked at Chen Fei's inquisitive face, lifted his gold-rimmed glasses, and his gaze was far and deep.

Half ring, answered.

"Yes and no!"

"Teacher You, you follow your train of thought." Strong recommendation.

Recent research has found that quantum entanglement is capable of crossing the so-called "time barrier." You Nanshan continued to speak.

"A foreign non-human laboratory has done many excellent experiments since 1979. The results of experiments on human consciousness have caused a great deal of debate. ”

Scientists use random number generators to track what is known as "group consciousness." The REG (Random Event Generator) plots the data into graphs. There is a spike in the chart, and it is after this peak that major events that affect the world occur.

PEAR tries to find what scientists call a "resonant state," and they say the data shows "signs of persistence when confronted with people who share cognitive and emotional activity." ”

In "Correlation of Continuous Random Data of Major World Events", it is clear that the multi-dimensional hyperbolic interface of quantum consciousness constitutes the data summary. ”

"It is hypothesized that the generation of group anomalies is emotional/IQ-driven, allowing participants to form a common "circle of consciousness", and REG confirms this through randomly generated anomalous data. ”

"The results of the study convinced most of the people who supported the project that a sense of community could predict the occurrence of major events."

"REG data shows that these major events are concentrated at the peak, such as the death of Princess Diana."

"The hypothesis that the mass consciousness can predict is based on the data that has been collected, not on the results of experiments. Similarly, critics began to question the effectiveness of the project and the methodology of the data collection process. ”

"There is no doubt that the peak of the incident was identified as a "point of divergence". These events disrupt the connection of time and space in consciousness.

"In addition to causing the unconscious to participate in an event and turn back time, spikes can also shift consciousness to another reality or timeline, and the impact of the event forms a fork in the road: the possible future, the least likely future, or the reset of the past."

"Well, it's close." ** Shook his numb palm.

"This is the transfer of the will of the group?" Chen Fei was deeply confused.

Younanshan was silent for a while and spoke.

"Or as it could be understood, another Earth, another timeline."

"Time is more perceptual than reality, so it's real. Cognitive awareness shapes the environment in the same way that we shape the things around us. ”

"Some world-renowned physicists believe that if the universe is reshaped, everything will go off the rails. How can cause and effect change go the other way around? ”

"Recent experiments in the Black Tech Lab have shown that the effect can precede the cause, at least at the subatomic level. However, the subatomic level is the basis of existence, and the binary reality of the universe - particles and waves - are the two parts of the quantum. ”

"Incredible things are happening at the wrong time and place. Visitors to us weren't supposed to be here, (see: A Woman from Another Universe Awakens Here PS: Extracurricular Reading, Not Recommended Reading at School.) ), earthlings find themselves on another earth (see: Multiverse Chaos: Girls and Strange Men Swallowed by Parallel Universes Come to Tokyo PS: Extracurricular Reading, Not Recommended for Reading at School.) ）”

"When the evidence is conclusive, the existence of another time, space and living being is undeniable."

"How many Earths are there? Maybe endlessly... Dinosaurs did not extinct the Earth, the Earth that continued to build starships ... Princess Diana is still alive on Earth... Or the earth where women choose to wear red dresses instead of blue dresses. ”

"Therefore, in the multiverse, in parallel worlds, the same cause in each world will eventually get different results." You Nanshan ended his speech.

"That is, we first upload our consciousness to the host of the universe, and then through the synthesis of countless thoughts, we change what has happened, or we directly reset time and change the past?" Chen Fei asked.

"That's what I meant, no matter how bad it is! We also have multiverses to explain the same cause and effect, but in different directions. "**Strong Echo.

Younanshan didn't speak, and the bell rang after class.

In this way, this physics class was not taken.

The class was delighted and encouraged them to find more bizarre questions to hedge against the physics lesson.

The two took out the notes from this class to find Gan Yi, but Gan Yi still snorted.

"This physics teacher is a defender of reductionism, and such a person actually lived through the 19th century to modern times."

"Also in the 19th century, there was a very different class of equations that scientists in the 19th century knew very little about, and that was nonlinear equations."

Gan Yi gave a speech.

"Nonlinear equations are particularly suitable for discontinuities, such as explosions, sudden breakage of materials, and high degree of deflection."

"The problem is that dealing with nonlinear equations requires mathematical skill and an intuitive understanding that is not yet available."

"Victorian scientists were able to solve the simplest nonlinear equations for a few special cases, and the general behavior of nonlinearity was mysterious."

Thankfully, 19th-century engineers didn't need to devote themselves to this mysterious world to accomplish their mechanical feats, because "linear approximations" would work for most of the important situations they had to deal with. ”

"Linear approximation is a variant of differential equations. They rely on mundane intuition and tried-and-true, trustworthy reductionist causal associations. ”

Thus, these equations are a kind of trick that obscures the unexpected face of chaos. Once again, scientists cling to the old reductionist dogma. ”

"However, the beast in the dream will devour those who avoid him after the dream ends, and the non-linear demon will soon manifest itself!"

"A nonlinear equation is like a mathematical description of the transition zone, and the solver takes the superficially formal mathematical landscape and suddenly finds that they can be in a different reality."

"In a nonlinear equation, a small change in one variable has a disproportionate, even catastrophic, effect on the others."

"The correlation between the elements of an evolutionary system can remain relatively constant over a large numerical range, but at certain critical points it will split, and the equations that describe the system jump into a new state. The values that turned out to be very close suddenly separated. ”

"In a linear equation, the solver can use one solution of the equation to derive other solutions. For nonlinearity, it doesn't work. Although they also have some universal properties, nonlinear solutions tend to be tricky and unruly. ”

"Unlike the smooth curves of linear equations that students draw in high school math class, the atlas of nonlinear equations shows a variety of turbulences, such as rupture, looping, recursion, etc."

"Nonlinear equations can be used as models for seismic eruptions. When two huge plates covering the Earth's lithosphere squeeze against each other, irregular pressure is created along the fault line. ”

The equation shows how this differential pressure grows over the decades as the underground rock formations move closer until the next millimeter hits a "critical" value, at which one plate begins to slide and ride on top of the other, and the stress is quickly released, causing violent earthquakes in the area, and after the initial earthquake, the unstable aftershock pattern continues. ”

"Nonlinear equations can cleverly simulate seismic models and give people a deep understanding of the development of complex events in the stab, but they do not allow researchers to accurately predict when the next earthquake will occur, and we will learn that in the nonlinear world (including most of our real world), accurate predictions are both practical and theoretically impossible, and nonlinearity shatters the dreams of the reductive wheel."

Gan Yi finished the above in one breath, picked up the purple sand cup, and took a big sip of water.

**Strong mouth wide open, hands rubbing vigorously in hair, expression painful.

Chen Fei's expression was hideous, half loud, and he summed up, "In the world of high flickering, only the unexpected, the unexpected!" ”

But, in fact, Chen Fei is more or less ignorant.

Therefore, in the evening self-study, Chen Fei tried to let himself no longer look at the world with a reductionist framework, but instead pondered with non-linear thinking.

For me, the end result of reductionism is that the memory on my memory line is reduced by one to zero.

Under this linear reductionist mechanism, man is manipulated, unconscious, and passively received.

So what is it that causes the obsession?

Things can be dusted down.

The feeling when something happens can be dusted.

Only one person has been here, and the mark left after leaving seems to be indelible.

What can I do to pass on what I want to say to her?

It's not fair, it's really unfair.

In my mind, you can come when you want and go when you want.

How can I tell you what I think?

People like Qiuhong come to have letters!

Yes, write a letter.

Chen Fei pondered a little and flipped out a book of stave.

Tear off a page.

After thinking about it for a while, I put pen to paper.

"Who are you?"

"You're in reality and you're in your dreams, what do you want to tell me?"

After reading it for a while, I was not satisfied.

Shredded the paper.

I took out the new paper and thought about it for a while.

Got down to paper.

Who is saying in the dream every night?

May you not have to wake up again in this life

So that the dream will always have only a pair

Kiss the figure every minute and every second

Can I ask you casually at this moment?

Is there a lonely shadow in your dreams?

Or maybe I have a face in my dreams

Always listen with you?!

Recurring dreams

More or less speculative

I don't believe in good dreams, but I believe in love

It can light up my life

I hope you can do it

Tomorrow morning without dreams can be forever

The paper was folded, but there was nowhere to deliver it.

On the paper brow is written "To you in your dreams!" ”

The school bell rings.

Put the letter on the desk.

Left the classroom.

The next morning, I entered the classroom, and I was tossing and turning in anticipation in my desk, but I saw that the letter was still quietly dormant.

Very disappointed, I took out the letter and wanted to tear it, but found that there was a bright red font on it.

"It's me, Zhang Xinyi."

Reply! Reply!

While Chen Fei was excited, he desperately recalled who Zhang Xinyi was!

A feeling of strong rise, it must be the person I love, otherwise the emotions of missing her will not contain nostalgia, reluctance and sadness.

Got down to paper.

"We must have loved each other, right?"

The red handwriting on the letter began to be updated synchronously after Chen Fei's blue-black pen was written.

"Love is a kind of distance, longer than cosmic years, farther than light years. I can't forget you, but I won't see you again. ”

"So, what is our relationship?" Chen Fei wrote hard.

"We're classmates." Reply in red handwriting.

Chen Fei was disappointed.

The classmate in the girl's mouth is her most desperate title.

"I don't believe it, I know I must like you very much, otherwise I can't forget you."

"You must like me too, or you wouldn't have been following me all the time."

Chen Fei's eyes were furious, waiting for the reply from the red handwriting.

I don't believe it, there is no love for no reason, you and I don't love each other, what are the two of us entangled in.

Soon, the red handwriting returned.

"You can't be afraid of losing love when you have it, and you can't hate love after you lose it."

I...... It's a day! How did you meet such a pen pal with a tone of literary youth?

Chen Fei didn't want to dwell on it anymore.

"What are you looking for me, what are you trying to tell me!"

"I hope you can bring me back!"

"I dare to break into the tiger's den in Longtan, you can say the address!"

"You know the golden egg, right?"

"Yes!"

"Destroy it and I'll show up!"

"This golden egg is now being treated as a treasure by the relevant departments, are you instigating me to destroy public property?"

"Don't you dare to break into the Longtan Tiger's Den, Chen Fei, who I know, has never been cowardly in any scene."

"No problem, I'll go and destroy the golden egg, I just don't know how."

"Go find aqua regia!"

"Aqua regia? Which green onion is aqua regia? Chen Fei was puzzled.

The red handwriting was no reply.

The bell rings for the end of class.

Anyway, hurry up and find the person named Aqua regia.

Several class leaders in the second year of high school asked in turn, but no one knew that there was such a person.

To be felt.

What a frustrating name!

There is no such person in the third year of high school.

I feel the same way.

What a frustrating name!

The class bell rings.

This class is a chemistry lab class.

Chen Fei entered the laboratory, ready to slip away immediately while people were unprepared.

The chemistry teacher seized the favorable terrain and sat at the door, condescending, looking down on the common people.

Chen Fei helplessly lay on the table, writing back and forth on the paper Wang Shui, Wang Shui, Wang Shui.

But seriously, the name is really watery!

These two words were seen by the chemistry teacher who came over for inspection.

"Are you looking for aqua regia?"

"yes, you know him?"

"Aqua regia is not human."

"That's it, such a name for water, so likely to be a person?"

"Aqua regia: is a mixture of concentrated HNO3 and concentrated HCl. The volume ratio of concentrated HNO3 to concentrated hydrochloric acid is 1:3 in the laboratory

HNO3+3HCl=2H2O+Cl2+NOCl" The chemistry teacher patiently began to explain.

"Basic copper carbonate?" Chen Fei nodded.

Aquaregia (aquaregia), also known as "royal acid" and "nitro hydrochloric acid", is a very corrosive, yellow smoke liquid, is a mixture of concentrated hydrochloric acid (HCl) and concentrated nitric acid (HNO3), its mixing ratio can be seen from the name: king, three horizontal and one vertical, so the volume ratio of hydrochloric acid and nitric acid is 3:1. Aqua regia is generally used in the etching process and some detection and analysis processes. ”

"That means aqua regia can be used to melt gold?" Chen Fei's eyes lit up.

Aqua regia contains a series of strong oxidants such as nitric acid, chlorine and nitrosyl chloride, as well as a high concentration of chloride ions, the oxidation ability of aqua regia is stronger than nitric acid, and some metals insoluble in nitric acid such as gold and platinum can be dissolved by aqua regia, so aqua regia is called the king of "water". The reaction equation for dissolving gold in aqua regia is given below:

Au+HNO3+4HCl=H[AuCl4]+NO+2H2O

Aqua regia is very easy to decompose and has the smell of chlorine, so it must be prepared and used. ”

"Can you give me a little configuration, I want to save people's lives and build a seventh-level floating slaughter." Chen Fei grabbed the chemistry teacher's wrist and said eagerly.

"If it were another school teacher, I wouldn't have agreed to your request at all." The chemistry teacher said solemnly.

"You say but." Chen Fei knew that there was a play as soon as he heard it.

"Because this is holy heaven!"

Chen Fei carefully held the glass bottle and hid it on his body.

Take a deep breath.

entered Gan Yi's big office.

A group of white coats are working at the desk.

The golden eggs are kept in a transparent safe.

Gan Yi settled in front of the box.

"Mr. Gan, I have something to discuss with you!" Chen Fei's hippie smile.

"We really don't have much to talk about other than you want to destroy the golden egg!"

"How do you know?"

"Actually, someone told me about the golden eggs!"

"Are you going to let me destroy it, then?"

"It's not for you to destroy, it's just that we're experimenting with a way to open it." Gan Yi smiled inscrutablely.

"Mr. Gan, is it really good to guard and steal like this?" Chen Fei was not at ease.

"Do you think it's better to have a dead golden egg or a living time traveler?"

"Stand up and down!"

Gan Yi opened the safe as if no one was around, and motioned for Chen Fei to do it, and Chen Fei sprinkled the royal water on the golden egg.

"The oxidizing ability of aqua regia is stronger than nitric acid, and inert metals such as gold and platinum are insoluble in concentrated nitric acid alone, but can be dissolved in aqua regia, mainly because nitrosyl chloride (NOCl) in aqua regia has a stronger oxidizing capacity than concentrated nitric acid, which can make inert metals such as gold and platinum lose electrons and be oxidized." In Gan Yi's self-talk, the tall golden egg turned into a puddle of soft mud.

Chen Fei nodded to Gan Yi. Ran briskly back to the classroom.

At that time, the evening self-study had just begun.

Chen Fei saw Zhang Xinyi sitting in the second row, and the window was bright reflecting her face.

seemed to have a premonition of Chen Fei's gaze.

Zhang Xinyi turned her head.

smiled indifferently at Chen Fei.

Chen Fei was very pleased.

"The bronze mirror seal is innocent and tied in a ponytail, if you are wild, I will accompany you with wine in this life!"

In physics class, Younanshan's tone was a little low.

"Regarding the topics I said two days ago, such as time travel and time reset, I thought about it carefully, and I think that in my previous cognition, it is valid."

"However, the discipline of thermodynamics discovered a world enslaved by time."

"In thermodynamics, things change in only one direction."

"Time is irreversible, it has an arrow."

"Einstein's friend Besso was born and died of old age, sickness and death, and he could neither live forever nor rejuvenate. The car breaks down into a pile of rust, and a pile of rust can't be reassembled into a car. ”

"Because of this thermodynamic discovery, physicists are staring at the so-called pessimistic time – the time of decay and decomposition."

Finally, I quote Einstein's letter in memory of his friend: "Michelle has left this strange world before me. It doesn't matter. For those of us who are determined physicists, the difference between the past, the present and the future is just an illusion, albeit one that will not change for a long time. ”

"Let's start the midterm exam mock test!" (To be continued.) )