The so-called oxygen, which exists in the air, is a very important gas, which must be used everywhere, it must be necessary for people to live, it must be for fire to burn, it must be necessary to remove impurities in iron ore, and the most important thing is to launch a spacecraft! Li Ruixiu's eyes suddenly lit up, and he was one step closer to becoming an immortal. Pen @ fun @ pavilion wWw. ｂｉｑUｇE。 ｉｎｆｏ

The immortals can already produce oxygen in large quantities and cheaply, and the method of making it is very simple, the immortals will "compress" the air and turn the air into liquid. Then slowly decompress so that the nitrogen in the air turns into a gas and the oxygen remains in a liquid form. As for the scientific truth contained in this, Li Ruixiu only felt sensational, but he could understand it faintly, as if he had learned it once.

The way the immortals compress the air is very simple, it is to use electricity!

Li Ruixiu felt that a mouthful of old blood was choked in his throat, why was it electricity again? Why do I need electricity for everything I want to do? He suddenly felt that perhaps he should not rush to build his own laboratory and rocket launch base, but should first take out the money and study how to make electricity.

Okay, okay, the living can't be suffocated to death by that, can't steel be made without electricity, so Li Ruixiu began to think about how the immortals could prepare oxygen without using electricity, and soon after, he found a method in the student textbooks of the immortals, in the history of the immortal world, there were also immortals who studied alchemy when they had not yet ascended, and they found that heating saltpeter would produce a kind of yin qi that could support combustion, and this yin qi was later proven to be oxygen.

Li Ruixiu carefully studied the scheme of making oxygen from saltpeter, which must be 400 degrees Celsius to produce oxygen, and temperatures above 500 degrees Celsius will produce oxygen and another gas.

Saltpeter is a thing called stone, fire nitrate, and tooth nitrate, which is used by craftsmen to make cannons. When it's hot, that's what makes ice at home, so it's still available on the street now, and Li Ruixiu hurriedly asked Chang'an to buy thirty catties of manganese for himself on the street.

After Chang'an left, Li Ruixiu continued to study the oxygen of the immortals, the immortals made oxygen in a variety of ways, for the study of these substances there is a professional discipline to do chemistry, the essence of which is to study the changes of substances, the content is complex and difficult to break, Li Ruixiu faintly felt that he could remember it at a glance as if he wanted to learn, but he really didn't know how he would understand these mysteries, and some specific things could not be remembered.

Chemistry divides the changes in substances into oxidation reactions and reduction reactions, and the oxygen that you want to make now is the basis for most oxidation reactions, and oxygen can help almost any substance burn. Li Ruixiu saw the immortals telling those children about the role of oxygen in class, a piece of wood with only a little spark in the oxygen can be burned again immediately, and a red wire put into the oxygen will also burn. Li Ruixiu was very interested, how could he dare to imagine that iron could actually burn, and it burst out with such a dazzling flame.

This gave him a lot of confidence, he believed that if the molten iron was put in oxygen, the molten iron would definitely be able to burn, and then a lot of heat would be generated, according to the experiments of the immortals, combustion was a violent oxidation reaction, if the more intense the burning, then the more heat would be obtained, but it was still necessary to make a heavy converter to maintain this temperature.

The planet where I am located, there is no high-temperature kiln, it is entirely because people only need 1300 degrees Celsius to fire the best porcelain, and then the use of wood, charcoal, and coal cannot reach the temperature at all, and the high-temperature kilns of the immortals can reach 1800 facilities, but they all use "oil", a substance that is thicker than water and buried deeper than water, but in fact, I also have oil here. Volume XXIV? Magazine 1 contains: "There is oil in the territory of Yan and Yan, and it is said that 'Gaonu County produces fat water', which is also."

There is only a small amount of oil left on the surface here, and it is not as good as the immortals who can extract a large amount of oil from below the Yellow Spring underground, and the establishment of that kind of high-temperature kiln is also very complicated. It is still convenient to make only one sample and use oxygen.

Immortals can wage war and destroy the country for oil and this kind of thing, Li Ruixiu is also selfish, now people use oil only for lighting, healing and ink making, and there are wars to burn the enemy army, but in the final analysis, he does not attach great importance to it, and does not play an important role in oil at all, he will build a spaceship in the future, and many things rely on petrochemical industry, so he wants to buy more oil-producing ground when people generally do not pay attention to it.

Li Ruixiu shook his head, shook off his fantasies, picked up a pencil and ruler, wrote and drew on the paper, and began to design his own triangular pyramid, since he decided to install it on the spear, it didn't need to be so long, the blade length was nine inches enough, and there must be a round sleeve behind it for fixing on the wooden pole, and 3 pairs of holes should be left on the barrel for inserting the pin, otherwise the triangular pyramid would be pulled out a few more times, and the cone would easily fall off.

Since Li Ruixiu plans to use molten steel to pour, he has to make a mold, fortunately, Ying Chao's casting technology is very developed, and a very suitable mold can be obtained by using the method of lost wax casting, but this must first have a reference mold. Li Ruixiu handed over the drawings to Chang'an and asked him to take them to the carpenter's shop to carve an original mold, he was not worried that Chang'an would leak his drawings, King An was not a person who competed with others for this kind of interests, the important thing was that there was no steel that he could make by himself, and it was useless to pour this thing out of pig iron.

Li Ruixiu called Zhang Da again and asked him to go to the blacksmith shop in the south of the city to find a craftsman and workshop that could make wax patterns. Then he sat in his room and worked out how to make oxygen and pass it into the pig iron furnace.

As Li Ruixiu expected, all the subordinates of their family were spies of the imperial court, so they would naturally show Li Ruixiu's pattern to the secret guard, after all, the first two princes liked it very much, and also ordered them to pay attention to Li Ruixiu's movements in this regard.

Li Ruixiu's pattern was fine and clear, and the carpenter quickly built a wooden triangular pyramid, which was not sent back to Li Ruixiu, but placed in front of King An, who was training in the Chinese army camp.

An Wang and several of his lieutenants looked at this novel weapon, the weapon is triangular, each side has grooves, the front is thin and the back is thick, each edge and thorn tip are made very sharp, even if it is replaced with fine iron, the weight of the hand will not be too heavy, everyone knows how strong the assassination power of this thing is just by imagining, but after circulating and playing for a while, they all showed disappointed looks.