"Well done." Ding Zuo is very satisfied with his son's ninjutsu, and sure enough, he is worthy of being a Qiu Taoist family, and he mastered the fire escape ninjutsu in one day.

"It's alright." Ding Ci shrugged helplessly, his fire escape ninjutsu has only mastered the skin, the persistence and the size of the fireball completely depend on luck, and it can achieve the effect just now, it is completely because of luck and the fire itself, and there is nothing to be proud of.

"It's already pretty good." Dingza's eyes were reflected in a bright glow by the flames. "How's it going, did you try something?"

Ding Ci shook his head, he didn't feel anything except to create a larger ball of fire.

"I'll go get some more firewood." Ding Za noticed that the fire was particularly strong, and the firewood was consumed quickly.

"Okay." Ding Ci replied casually, but his eyes were staring at the bonfire in a daze.

"Wait!" Ding Ci suddenly shouted, and a flash of inspiration flashed in his mind.

"What did you just say?" Ding Ci asked eagerly.

"I said I'm going to get firewood." Ding Za looked at his son inexplicably, a little puzzled. "Your fire just now made the firewood burn faster, I'll go get some and replenish it." Ding Za said again.

"Yes, the firewood is consumed." Ding Ci repeated with some nervousness.

"Consumed by my little fireball, right?"

"yes." Ding Za confirmed again.

"I see!" Ding Ci suddenly shouted, and an unusually happy smile bloomed on his face.

"Understand what?" Ding asked him, a little confused.

"Dad, don't add the firewood you brought to the fire, put it aside and pile it aside, I'm going to test an idea." The corners of Ding Ci's mouth unconsciously hooked up a smile.

"Okay." Ding Zuo took a pile of firewood and placed it beside him, then walked over and said to Ding Ci: "It's piled up over there, what are you going to do?" ”

"Look, Dad." Ding Ci's eyes revealed a sense of confidence.

"Fire Escape: The Technique of Small Fireballs." A tiny pillar of fire erupted from Ding Ci's mouth onto the pile of firewood.

Boom!

Another bonfire crackled and began to burn.

"Sure enough!" Ding Ci said to himself.

"Huh?"

Ding Ci looked at his father, who was obviously puzzled, and explained: "My fire escape, the small fireball I made with chakra can ignite firewood. Ding Ji pointed to the freshly lit fire. He pointed to another fire.

"The campfire over there can be combined with my little fireball to form a larger flame ball."

Ding Ji's fingers changed into fists and slammed them in front of his chest.

"This shows that the fire made from the chakra and the flame produced by the burning of the firewood itself is a flame."

"Fire is fire, fire is also fire, fire is also fire, fire is also fire when matter burns, there is always only one kind of fire."

"I should have thought of that." Ding Ji finally grasped the most crucial point that he had missed before, he had separated ninjutsu from ordinary things, which was a completely wrong way of thinking.

"Well, yes, it's all fire." Ding Zuo picked his head, he thought this was normal, was there any difference between the fire and the firewood, he had never cared about this.

"What is fire?"

"Fire is visible light or other physical manifestations that occur in a chemical process in which combustion and air are mixed and rapidly transformed into combustion products."

"Flame burning is a chemical phenomenon as well as a physical phenomenon."

Ding Ci ignored Ding Za's blank expression, as if he was explaining to Ding Za, and seemed to be caught in the world of self-argumentation and analysis.

"Flame is, by its very nature, a state or phenomenon, a burning combustible gas, glowing, heating, flickering and upward. It emits light by heating the air molecules around the reaction zone in an exothermic reaction and moving at high speed. And part of the energy in this reaction is diffused outward in the form of heat energy, which forms high temperature. ”

"I don't understand why chakra can turn into flames, but I know something." Ding Ci's gaze became extremely sharp, and his hands grabbed into the void, as if he held some kind of truth.

"No matter what the world, there is always only one flame."

Syllable!

The fire grew stronger, and a trace of sparks splattered around Ding Ci, as if a red halo surrounded him.

Ding Za looked at his son's extraordinary momentum, although he still didn't understand what his son said, but he also felt that this knowledge was probably not ordinary.

"Since flame is just a reaction or phenomenon, then it is simple, there are three conditions for the flame to occur: combustibles, oxidants, and temperatures to reach the ignition point." Ding Ci continued to analyze. "If you look at these three conditions, Huo Dun may be able to have new changes."

Ding Ci's heart moved, and he had a crazy idea.

"Dad, can you help me get some pure oxygen tomorrow?" Ding Ji looked at Ding Zuo expectantly.

"Pure oxygen?" Ding Za still understands this term, which is a high concentration of oxygen.

"Konoha Hospital usually has some reserves there, so it should be fine." Ding Zuo thought for a moment and replied.

"Good!" Ding Ci was already a little eager to test his idea.

"Now we can go back to sleep." Ding Za looked at his son with a smile.

"Of course, put out the fire first."

*****************************

The next day, after Ding Ji continued to practice with Qiu Dao to take the wind, he went home directly to find his father, Ding Za had obviously prepared pure oxygen, and carried a large tank of high-concentration pure oxygen used by Konoha Hospital.

Ding Ci looked at such a big jar, a little depressed, there are no industrialized supplies of different volumes, it's really troublesome!

In the previous life, the medical pure oxygen regulations were above 99.5%, but most hospitals could not meet this standard, and most of them were above 85%, which was good enough, of course, for patients.

In the previous life, pure oxygen was produced by the low-temperature air separation method, which simply means that the air is pressurized and cooled to a liquid state, and then the oxygen is separated according to the difference in the boiling point of oxygen and other gases. Ding Ji wasn't sure how the jar of pure oxygen from Konoha Hospital in front of him came out, and he didn't know its exact concentration, but there was no way, so let's make do with it first.

"Dad, help me get the tube and plug it into this oxygen tank, I'll be useful." Ding Ci had already thought of a way to experiment.

Ding Zuo and Ding Ci acted separately, Ding Ci ran out and bought a few small balloons, he was going to use pure oxygen to inflate the small balloons, and then he could experiment.

When everything was ready, Dingza came to the courtyard with a small balloon filled with pure oxygen, where he was going to experiment.

"Dad, you'd better stay away." According to his expectations, this upgraded version of the fireball may still be somewhat powerful.

"yes, okay." Ding Za stepped back vigorously, he was now looking forward to his son's experiment.

"Alright." He threw the small oxygen balloon into the air in the distance, and his hands quickly sealed.

"The density of pure oxygen is about 1.4, which means that the balloon will not float up in the air, but will make a parabolic motion and sink under the action of gravity." Ding Ci secretly calculated in his heart.

"Fire Escape: The Technique of Small Fireballs." A slender pillar of fire erupted, and the front end of the pillar of fire just hit the small oxygen ball, and the light in Ding Ci's eyes flashed, and he had already calculated.

Bang bang bang!!

The skin of the balloon was instantly extinguished by the pillar of fire, which quickly piled up into a large fireball with a diameter of about 2 meters, and the color also changed from dark red to an imposing golden yellow.

What's even more exaggerated is that Ding Zuo stood far away, and a scorching heat was obviously transmitted from the golden fireball, and the green grass below the fireball instantly seemed to be completely evaporated, and began to turn yellow and wither, and the air was filled with an annoying heat.

"It worked." Ding Ji's eyes widened, his fists clenched, and he had a faint feeling in his heart that a new ninjutsu door was opening to him.