Preface:

Heavy water: is a compound composed of deuterium and oxygen. The molecular formula D2O has a relative molecular weight of 20.0275, which is about 11% higher than the relative molecular weight of water (H2O) of 18.0153, so it is called heavy water.

In natural water, the content of heavy water accounts for about 0.02%. Since the properties of deuterium and hydrogen differ very little, heavy water is very similar to ordinary water.

Composition of matter: Matter is made up of molecules, ions, atoms, molecules are formed by atoms combining through covalent bonds, and ions are formed by atoms through ionic bonds. Different substances are made up in different ways.

Molecular force: Molecularforce, also known as intermolecular force and van der Waals force, refers to the interaction between molecules. When two molecules are far apart, it is mainly manifested as an attractive force, which mainly comes from the interaction caused by the polarization of one molecule by the rapidly changing electric dipole moment of another molecule with time. When the two molecules are very close together, the repulsive force becomes the main one, which is due to the repulsion caused by the outer electron clouds of the molecules starting to overlap.

Li Chunfeng looked at Luo Yun's extremely resolute face, every time this kid has improved since he cultivated, it was far beyond his imagination, maybe there would be a miracle this time. So he nodded and agreed.

The first stage is the gathering of energy.

"Boy! To learn how energy gathers, you first need to know how heavy water is made. ”

"Atoms make up molecules, and molecules make up heavy water!" Luo Yun said with almost no hesitation.

"Good! The old man asked you why the water molecules did not disperse and could be combined! ”

"It's ???? I really haven't thought about it. "Of course Luo Yun, a naughty student who always skips class, doesn't know.

"Hey!! Quite simply, there is a force between molecules, and this force is called molecular force, and the molecular force can be gravitational or repulsive, and the accumulation of energy is actually a change in the molecular force. Boy, pay attention to what happens if I increase the forces between the water molecules. ”

Speaking of this, Li Chunfeng put his hand directly into the water, and then slowly pulled it out, a water ball the size of a football appeared in his palm, Li Chunfeng threw this water ball into the air, the strange thing is that the water in the water ball did not break, Li Chunfeng stretched out his hand to catch the water balloon, put it in his hand and pinched the whole water balloon burst at once, and a large amount of water leaked out from the palm of Li Chunfeng's hand.

"The old man strengthens the molecular force between the water molecules through the accumulation of energy, so the water will not be so easy to disperse and can maintain a certain form, but if the old man reabsorbs the energy from the water, the gravitational force between the water molecules in the water balloon will be reduced, and the water ball will naturally not be able to maintain."

"But other substances, like metal, don't bother so much!" Luo Yun suddenly thought of this question.

"Indeed! This is also the reason why the water and fire systems are the most difficult to cultivate among the five systems, and the junior cultivators of the other three systems only need to concentrate their cultivation energy, because they can achieve the same power with the help of spiritual power bullets made of solid materials such as metal, wood, or stone. ”

"Then why don't we just use solids for cultivation?"

"Stupid!" Li Chunfeng used his cane to knock Luo Yun's head hard.

"Didn't the old man emphasize the importance of the innate attributes of the spirit body to you many times, although it is possible to use solid matter to skip the cultivation step of energy gathering, but because there is a matching relationship between the attributes of matter and energy, the mismatched energy cannot change the force between the molecules of matter at all, so you will not be able to succeed in cultivation for the rest of your life."

Luo Yun, who was originally going to find a shortcut, was a little frustrated when he heard Li Chunfeng say this.

"But there are advantages and disadvantages to everything, and for the middle and advanced cultivators in the ghost realm, the gathering of energy is indispensable, because the gathering of energy also has an important role in changing other properties of matter."

Seeing that Luo Yun was a little frustrated, Li Chunfeng continued.

"What are the other properties of matter?"

"For example, appearance, form, etc.! It may be difficult to understand directly, but let's show you the old man's housekeeping skills."

A pad for both feet. Li Chunfeng jumped directly into the pond, but this time he did not stand on the top of the pond but sank directly, Luo Yun stared intently at the place where Li Chunfeng jumped down, looking forward to Li Chunfeng's show again.

After less than a minute, two whirlpools of the same size appeared in the pond, and two figures standing side by side slowly appeared in the whirlpool, Luo Yun took a closer look at the figure on the left was Li Chunfeng, and then looked at the figure on the right...

！！ It is also Li Chunfeng, that is to say, there are two Li Chunfeng in the pond, Luo Yun rubbed his eyes and looked, yes, it is indeed two Li Chunfeng who are the same.

"Master! You, do you still have twin brothers? ”

"Hey, hey, hey! What twin brothers, at this time, one of the advanced skills of the water system, the water body, don't underestimate this water body, at a critical time, it can not only fight for you, but more importantly, it is one of the rare life-saving skills to confuse the enemy. The movements of the mouths of the two Li Chunfeng were almost synchronized when they spoke.

"Broken!" The two Li Chunfeng shouted out together, and then the "whoosh" on the right suddenly turned into a puddle of water.

"Now you understand, as long as you learn the most basic water bomb technique, the other spells of the water system will be easy! But everything is difficult at the beginning, and the road to cultivating this is very difficult! Are you confident, after all, there is too little time left for you right now. ”

Everything starts with a firm heart, believe in your own strength, so that you will definitely succeed, now Luo Yun is no longer the kid who is greedy for life and death, and many near-death experiences have made his consciousness extremely firm. I'm not even afraid of death, do you care about the difficulty of this!

"Master! I want to continue cultivating the water bomb until I succeed! Luo Yun said word by word to Li Chunfeng without hesitation.

Li Chunfeng nodded silently, and said to Luo Yun with great enthusiasm: "Okay! The old man will train you to death, come on, boy. ”

"The old man has thought about it! It is indeed a bit difficult for you to learn to collect energy on such a small water droplet at one time, so start with a larger water substance, the water droplet is indeed too difficult for you, so let's start with the water polo, you must first gather energy into a water ball the size of a football like the old man, but at the same time make sure that the water in the water balloon will not break when it is thrown into the air! Let's go! ”

Three days later.

"It worked!!"

Luo Yun was holding a water balloon the size of a football in his wet hands, although he couldn't make a water ball with just one hand like Li Chunfeng, but this was already a big improvement for him, Luo Yun threw the water balloon high, and then started counting seconds: "1, 2, 3,...... 10, broken! The water balloon burst in response to the sound, and the water splashed everywhere.

"It seems that the current energy can only last for so long at most, and it seems that I still need to continue practicing! The next step is to gradually reduce the size of the water balloon, preferably to the size of the glass ball."

In the past few days, Li Chunfeng has been by Luo Yun's side to give him guidance, Luo Yun's progress is faster than he imagined, and what is even more beyond his imagination is Luo Yun's extraordinary perseverance, almost sleepless non-stop cultivation, at most he will continue to cultivate after sinking to the bottom of the water to absorb a little energy, originally Li Chunfeng had little hope that Luo Yun would succeed in cultivation, but this kid is indeed very talented, and he even let him come up with a way to use his hands to gather energy.

The difficulty of energy aggregation lies in the control of energy flow, the energy must flow evenly between each molecule, only in this way can the energy be gathered between each water molecule, if the energy is unevenly distributed between the water molecules and the water molecules, the balance of force between the molecules will be destroyed, and the water balloon will burst and disperse. But for Luo Yun, who can only barely control the amount of energy now, this is tantamount to being more difficult than ascending to the sky.

However, Luo Yun came up with such a solution, which is to use both hands to control, the left hand will release the energy, the right hand will absorb the excess energy, and then quickly convert to the right hand to release the energy, the left hand absorbs the excess energy, through the left hand - water balloon - right hand energy flow between the three to form a cycle, so that you can adjust the size and flow of energy at any time, after three days of sleepless experiments Luo Yun finally succeeded in making the first water balloon.

Two more days passed.

"Genius! Genius, this kid is simply a genius! ”

Li Chunfeng looked at the water ball the size of a glass ball in Luo Yun's right hand and secretly exclaimed in his heart. Luo Yun's performance once again refreshed the record of the ghost world, as far as Li Chunfeng knew, no one in the ghost world could complete the cultivation of energy gathering in such a short period of time, not to mention the energy gathering in the water ball the size of a glass ball, Li Chunfeng spent 200 years to successfully cultivate the skill Luo Yun, but it only took 5 days.

Li Chunfeng didn't show too many surprises, and still said to Luo Yun sternly; "Basically, you can enter the second stage here, the concentration of energy."

The second stage is the concentration of energy.

"The concentration of energy is to concentrate energy into a certain range on the surface of the water balloon so that it can obtain enough kinetic energy, then the water balloon that obtains kinetic energy can overcome gravity and fly out at high speed, the smaller the range of energy concentration of the same size, the greater the kinetic energy obtained by the water balloon, and the power of the water ball will be greater."

In fact, Luo Yun had already carried out the cultivation of energy concentration when he was practicing the water flying shoes, but flying on the water was to concentrate the energy on the feet, and this time it was indeed necessary to concentrate the energy on such a small water ball, it seemed that the difficulty was not small.

After making a water balloon again, Luo Yun still took both hands and slowly released the energy from the palm, after the previous stage of energy gathering cultivation, he can now control the flow of energy relatively well, Luo Yun continued to flow energy to the palm of the hand, only to listen to the sound of "bang", the water ball flew straight out half a meter away and fell to the ground, looking at the ground without even a trace of impact.

"The energy is not concentrated enough, the power is too small, and it continues." Li Chunfeng urged on the side.

Luo Yun shrugged his shoulders, pumped his mouth hard, opened his arms, and mustered up the energy to start this round of training.

Another 3 days passed.

"The 10,005th, up!"

The water balloon flew out of Luo Yun's palm rapidly, and then slammed into the ground with a "bang", leaving a large pit with a radius of about 10CM, after 3 days of continuous cultivation, he can already concentrate his energy into the center of the water balloon within a range of about 2*2 cm, and now the power of this water ball is comparable to the power of the human world with a bazooka, but this is also the damage created when Luo Yun has exhausted 90% of his spiritual power.

"A big success! A big success! A big success! It's a pity that Master didn't see it when he wasn't there. Luo Yun, who had achieved great success, jumped and shouted excitedly.

"Humph! Kid is good, that old thing is good for you! I don't know when it started, and a black shadow stood in the corner of the black pool, and said maliciously.

As soon as he heard this voice, Luo Yun was startled, and hurriedly turned his head to look at the place where the black shadow was standing, only to find that the black shadow had already rushed towards him violently, and the black shadow punched violently, and the defenseless Luo Yun was suddenly thrown out, and fell into the water and lost his consciousness with a "snap".

(On August 9, 2016, Luo Yun learned the water bomb technique and was knocked unconscious by a black shadow)

Preview of the next section: Two-headed dragon?