In fact, many of the things ye Zan said, let alone for scientific and technological workers, that is, for educated students in the world of science and technology, will feel specious and even full of loopholes. But so what? Ye Zan didn''t come to popularize science for these inner disciples. He just wanted to introduce some ideas about magic through these introductions.


    Moreover, many basic knowledge of the world of science and technology, the theorems and laws that almost every middle school student knows, may not be able to be completely applied in this world. For example, the sun is not a star, but the condensation and manifestation of the so-called "Avenue". The moon is not a small non luminous satellite, but another avenue that is no inferior to the sun. In addition, this boundary is not a planet, there is no rotation, rotation day and night and changes in the four seasons, which are also another display form of "Avenue".


    Another example is the fire mentioned by Ye Zan, which says that fire is a phenomenon of luminescence and heating in material combustion. But can this explanation really explain everything? To know this world, in addition to this common fire, there are also different fires such as honglianye fire, Yimu green fire, Youming cangyan, Nanming lifire and so on. This is one of the reasons why people in this world generally regard fire as a material existence without thinking about "phenomenon".


    Of course, many things in this world may seem mysterious, but they can be explained by science in the end. However, the process of interpretation, or the way of verification, goes around a lot more than the original way of verification. Maybe those different fires with different names and different power functions are just the phenomenon caused by the combustion of a specific substance, but how can ye Zan verify it?


    Anyway, ye Zan now has the cultivation of Yuanying territory and has a very high generation in Yuqing sect. No one dares to question his words. In this world, most people still have a deep sense of awe for authority, and authority comes from strength and generation. Therefore, ye Zan can completely ignore those things and think about how to convince these disciples. It can be said that what he said is what he said. As long as it is not a particularly shocking thing, none of these disciples dare to question it.


    Ye Zan put forward the temperature and linked the temperature with power. Although it is not particularly absolute, it can be said in some aspects. Fire spell mainly causes damage to the enemy. At least in the primary spell, it is burning damage. As for explosion, there are really not many primary Fire spells that can produce explosion damage, or only with limited explosion damage.


    That is to say, although the most elementary fireball technique looks like a ball, it actually has no entity. It can be said that it is just to use the rules of magic to restrict a flame into a ball. Therefore, when the fireball hits the enemy, due to the disappearance of binding force, there will be a small-scale explosion like effect, but the damage of the explosion is very limited. In fact, such an explosion is just the energy diffusion of the flame without restraint.


    Of course, explosion itself is a process or phenomenon in which energy instantly breaks through the bondage and is converted into other mechanical energy to diffuse around. For example, firecrackers can only explode when the gunpowder can produce enough energy if they are tightly wrapped in paper. If there is no package, just spread the gunpowder on the ground and you can hear the sound of "cluster" when it is lit.


    Therefore, an important condition for explosion is that there must be a small enough space and sufficient binding force to restrict the energy, so that the energy can be accumulated to a certain extent quickly. Just like the grenade in the world of science and technology, if it is wrapped in a paper shell, it is a large firecracker. But only by using metal as the shell can enough energy be accumulated inside. Of course, using metal as the shell also plays an important role, that is, it can form fragments after explosion and cause fragment damage to the enemy.


    The binding force of fireball is obviously unable to reach the level of metal shell. Moreover, even if it is really made into a metal shell, the flame generated by magic is not enough to break through the solid metal shell. That''s really smashing people, or you can burn your opponent a little, but don''t expect an explosion.


    Another important condition of explosion, which can also be said to be essential, is that the volume expands sharply in an instant. Why do firecrackers explode? Because the gunpowder burns, a large amount of gas is produced instantly, and the gas will produce great pressure under the restraint of the shell. Fireball is just a simple flame, and there will be no violent volume expansion unless something else is added to it.


    Of course, the world also has the spell of explosion damage. Moreover, the principle of this kind of magic is similar to that in the world of science and technology, but the means of implementation are different. Basically, it is based on two kinds of magic energy, so that the two kinds of energy collide violently, and then produce the effect of explosion. However, this kind of magic is often considered to be more advanced. After all, it needs to manipulate two kinds of magic energy at the same time, at least the people who build the foundation can''t do it.


    Ye Zan has also studied and tried to improve the spells with explosion damage. However, those things are not suitable for these foundation building disciples. The road should be taken step by step and the food should be eaten one mouthful at a time.


    Now, what ye Zan wants to teach these inner disciples is to raise the temperature of fire and practice magic. Despite the explosion, the main damage of fire spell is burning at high temperature. The higher the natural temperature, the greater the damage.


    Ye Zan talked about the elements of combustion. He didn''t say much about the ignition temperature of combustibles, mainly about the impact of combustibles and combustion aids on combustion, in other words, on fire.


    These disciples all know that the fire will go out when it is smothered, but no one has really explored why. They also know that blowing makes the fire stronger, but they also haven''t explored why. For them, these things are taken for granted. What else is necessary to ask why?


    It''s just that people have different ways of thinking and different concerns. It doesn''t mean that people in this world are more stupid. You know, before the development of science and technology, people didn''t know these things. Can it be said that the ancients were more stupid than the later people. Without those discoverers, the vast majority of modern people are no better than the ancients. If no one puts forward the heliocentric theory, no one puts forward gravity, no one puts forward the existence of air pressure, etc., I''m afraid there will be no difference between people thousands of years later and those thousands of years ago.


    In front of those disciples, ye Zan did a small experiment, but he didn''t say oxygen, just that there was an existence in the air, which was essential for combustion. This statement did not arouse the resistance of those disciples. After all, they knew that "wind" could enhance the fire. But then yezan did another experiment to prove the effect of oxygen on combustion, which surprised all the disciples.


    The experiment was very simple. First, he took out some pure oxygen, and then ye Zan took out a thin iron bar and asked the people, "do you think it''s possible for me to ignite this iron bar without using magic?"


    If ye Zan uses magic, the disciples below will certainly answer "yes" without hesitation. Although in fact, even the fireball technique performed by Yuanying''s ancestors, the temperature of the fireball will not be much higher. However, the realm of Yuanying is already a very powerful existence for the disciples. Therefore, there is nothing that Yuanying''s ancestors can''t do in their hearts.


    However, ye Zan said that he only used ordinary fire without using magic. In other words, the cultivation of Yuanying realm hardly played a role in lighting the iron bar, which made those disciples hesitate.


    "Or is there any way to ignite this iron bar if any of you do it?" Ye Zan added another condition. He was also afraid of his cultivation, which made those disciples have the idea of blind faith.


    Hearing Ye Zan''s supplementary conditions, the disciples finally stopped hesitating and said, "it''s impossible. How can you light it unless it''s in the furnace."


    Seeing the disciples'' cooperation, ye Zan finally nodded with satisfaction, smiled and said, "then, next, it''s the time to witness miracles. Pay attention."


    With Ye Zan''s words, the lecture hall suddenly quieted down. Although the disciples were still full of disbelief, no one dared to talk to Ye Zan at this time. They held their breath and looked at Ye Zan''s hands one by one.


    Ye Zan tied a small wooden stick to one end of the iron bar, stretched it to the fireball floating nearby to ignite the small wooden stick, then took the iron bar to the glass bottle with oxygen, and slowly explored the iron bar from the mouth of the bottle.


    Those disciples looked at Ye Zan''s movements with curiosity, saw that it was only a small wooden stick used to ignite the fire, and looked forward to the miracle Ye Zan said. In their opinion, if yezan directly lit the iron bar with a fireball, it may be possible to ignite the iron bar. They can use the little stick and the bean fire to light the iron bar. It really makes them have no confidence.


    However, as the iron bar dipped into the glass bottle, the ignited small wooden stick suddenly burned violently, and the bean fire sent out an inconsistent light, and immediately burned on the iron bar bound with the wooden stick. Then, just when people thought the fire would go out, the iron bar suddenly gave out a dazzling light, and splashed a little spark, which was obviously lit.


    "Ah!" almost everyone could not help shouting when they saw this scene. In the world of science and technology, junior high school students have done experiments, but in this world, they are stunned by a group of adults. I''m afraid any junior high school student in the world of science and technology will disdain to say: bah, a bunch of earth buns who have never seen the world!


    The flame on the iron bar burned fiercely, but it didn''t last long. After all, the oxygen in the glass bottle is limited, which is not enough to keep the iron bar burning until it is finished. When the flame went out, ye Zan took out the iron bar and said to the people, "see?"


    Although, the burning end of the iron bar just melted into an inconspicuous water drop. However, these disciples have the practice of building a foundation, and can still clearly see the changes on the iron bar with good eyesight. Originally, they wondered if yezan had done something, or that the iron bar was just shining. However, seeing the melted and condensed water droplets, no one can doubt whether the iron bar was ignited just now.


    "It''s really lit!"


    "Yes, the flame led by the small wooden stick ignited all the iron!"


    "It''s incredible!"


    For a moment, those disciples seemed to forget their awe of Ye Zan and expressed their surprise.


    "Why can such a flame ignite this iron bar? I just told you that the ignition point of this iron is not low, so it can show that with the help of this combustion supporting material, the temperature of the flame has reached the ignition point of iron. Now, you know how important this combustion supporting material has always been in the air around us for combustion." Ye Zan summarized this small experiment.


    In fact, according to the physical knowledge of the world of science and technology, iron has no so-called ignition point. Therefore, ye Zan is right to do this experiment, but if people in the world of science and technology hear this summary, I''m afraid they can''t help laughing.


    Ye Zan certainly knows this problem. The reason why he wants to say this is just to make these disciples understand the importance of combustion aids. After all, these disciples are all monks. If you tell them that the combustion aid is so important and important, it''s better to let them see the influence of the combustion aid on spells, which can be regarded as luring them to benefit.


    "I see. The combustion supporting object has such powerful power. We didn''t know it until today!" a disciple said suddenly.


    "I always thought that using the wind to help the fire was just to make the fire spread faster. I didn''t expect that there was another reason." some disciples thought more.


    Ye Zan put away the iron bar and cleaned up the things for the experiment. When the disciples'' discussion became less and less, he said again: "you have seen the importance of combustion aids with your own eyes, so what''s the help for fire magic?"


    Hearing this, the disciples stopped talking. Everyone looked at Ye Zan intently and waited for ye Zan to give an answer. They also know now that what the ancestor Yuanying came to tell himself and others is probably about the improvement of magic.


    This is too important for them. After all, with their cultivation, it is impossible to cast any powerful magic. And the power of primary spells is really limited. Then, if there is any way to improve the power of spells without increasing the real yuan expenditure, it is equivalent to giving them another killer mace.