Ten days after discovering the comet, Wang Qi had already obtained the prediction of its impact.
As time goes by, astrologers' calculations have been revised several times, and the probability of impact is 98.8%, and the probability that the impact point is within a thousand kilometers of Phoenix is 69%.
Wang Qi is not a professional, so he doesn't know how to calculate the probability, and he doesn't quite believe that they have enough systematic knowledge of astronomy, but he can only believe it anyway.
It is unlikely that all members will run away, because the astrologer cannot calculate the specific collision point, and the large-scale migration cannot be fast, so they might just reach the collision point. Moreover, there is a contradiction between hoarding supplies and overall migration. Even if you don't have supplies, you won't be able to survive the first wave of impact.
I would rather trust that these igneous rock hills and the northern volcanoes in the dark land can withstand most of the shock waves.
I hope the main body of the comet is not too big.
The most feared situation of a celestial body impact is that the front end has touched the ground and the rear end is still outside the atmosphere. Such an impact will generally be close to the first cosmic speed. According to the mass-energy equation, if the speed is 30% greater, the energy produced per unit weight will be Nearly 70% more.
All I can do is hide underground and let nature take its course.
But what needs to be done still needs to be done.
For example, the royal city protection array business undertaken by the magic prop shop mage needs to be accelerated.
Regarding this project, there were some unexpected situations along the way. For example, the production of alpha-type alumina went extremely smoothly.
Wang Qi knows that temperatures above 1,300 degrees can convert any form of aluminum oxide into alpha-type crystals, which is the most stable state of all crystal forms.
However, there are some difficulties.
For example, hydrated alumina becomes a powder after dehydration, and the powder itself is not conducive to heat conduction. This will cause the alumina crystal to be mainly sintered in a small range... In human terms, the single crystal should be at the micron level, even if it appears macroscopically visible In the polycrystalline state, it will not form a whole piece.
If you must make large crystals, you need to heat the aluminum oxide above the melting point, which is 2054 degrees.
Such a temperature cannot be achieved under existing conditions. The maximum furnace temperature of the No. 1 furnace of the iron plant is only about 1,600 degrees.
It sounds very high, but in fact it is not surprising at all, because in the iron smelting workshops that used bellows in the agricultural era, the furnace core temperature could reach more than 1,300 degrees, not to mention the power hot blast furnace type that used crucibles.
With coal and coking coal, it is actually possible to reach higher temperatures by using the crucible shape of the No. 1 furnace, but the materials used to make the furnace cannot withstand it.
A strange thing happened. At a temperature below 1600 degrees, just by constantly trying to extend the sintering time, dozens of kilograms of alpha alumina crystals were successfully burned.
This situation is completely beyond Wang Qi's knowledge system. He can only guess that there are some differences in the rules of the microscopic scale of this world. As for what it is, it may be a subtle change in the standard model of particle physics, or it may be something else. Anyway, it’s right to classify everything that you don’t understand into quantum mechanics. Maybe the existence of magic power has something to do with it.
Next, a furnace specially built for firing alumina was built, and more than 300 kilograms of giant alumina crystals were burned out within half a month.
In order to solve the temperature dilemma, the inner wall of the alumina furnace is coated with porcelain clay, which means that the inside is made of porcelain after preheating. Although there is no way to accurately measure it, only through visual inspection and iron comparison, the maximum furnace temperature can be close to 1800 degrees. If it is not made of ceramics It has good high-temperature performance. Objects with a melting point of about 2,000 degrees generally become soft at this temperature.
It is also the furnace that produces 300 kilograms of alumina.
Before sending it to the project team, it was specially moved to the palace to show it to Wang Qi.
It has to be said that with a pair of naked eyes, you can't understand farts. You can only tell from the appearance that it is not a single crystal.
If the comet hadn't been pressing down on his head, Wang Qifei would have had to find a way to get tungsten and build a furnace that could burn alumina to its melting point to see how big of a crystal he could make under that condition.
This more than 300 kilograms of aluminum oxide should be of some use as the core of the royal city's protective magic array.
But even if it could be done, it would be too late to charge it. To protect the Wangting Tree from the impact of the comet, it would still have to rely on the previous forty kilograms of gems.
Wang Qi also paid close attention to the progress. When the comet could be seen at night through the thin volcanic ash, Jin Scorpion kept an eye on the project team for several hours every day and reported the situation at any time.
There is good news today: "King, the protection module of the protective array project has been charged to a level that can be activated. The people in the prop shop said that if it only protects against impacts from one direction, it should not be a big problem."
"Should?" That's not a good way to say it.
"They don't know what happens when a comet falls, and our people don't know how to calculate the collision equivalent."
It’s not that I can’t calculate, it’s that I can’t calculate.
The mass-energy equation itself is very simple, but the actual impact result depends on the size, density, and shape of the comet. The parts with low density are easily destroyed by atmospheric compression and frictional heating before landing.
The air burst is quite bluffing, but not powerful.
Let’s take the nuclear bomb as an example.
It sounds like the shock wave of a nuclear bomb can affect thousands or tens of thousands of square kilometers. In fact, an attack based on air blasts, with underground bunkers, would require 60 to 100 bombs to wipe out 80% of the living people in a city with a population of 3 million. 500,000 tons equivalent.
After this wave of explosions, more than 30% of the surface buildings will still be able to maintain their basic functions! Of course there should be no one alive inside.
Nuclear bombs kill people through light and heat effects. The light of a nuclear explosion is enough to penetrate a certain thickness of wall and melt human skin. The effect of the shock wave is not even as good as light when it is covered by a large number of buildings. The instantaneous radiation of the explosion and radiation sickness caused by nuclear dust are all subsequent consequences. Something happened.
The impact of comets is similar. In fact, the only ones that are really effective are large celestial bodies that explode at low altitudes and those that explode directly on the ground. The other things that explode fifteen or twenty kilometers away from the ground, as long as they are not directly below the explosion point, find a bunker. Basically no big deal.
In short, the calculation of the equivalent of celestial body collision is a very complex comprehensive science, especially for comets, which are a mixture of stone and ice. Without long-term close tracking surveys or even sampling, even with a complete set of theories, it is impossible to calculate the equivalent.
Wang Qi got the news about the magic circle and stopped asking questions. He still had to rely on himself.
Call the two generals of the garrison and ask them to coordinate the evacuation of the people in the royal city.
There is a huge underground place below the royal city. Excluding the city wall, pushing down from 50 meters below the Wangting tree, the total area of large and small flat areas is 100,000 square meters. The height of several large floors is enough to open two to three floors. In theory, It seems that it can hold hundreds of thousands of people. After all, a few tenths of an square meter is enough for one person to lie down.
In practice, even the theory is difficult to pass because of ventilation problems.
Carbon dioxide is heavier than air. On the surface, it will be evenly distributed in the lower air with the help of wind. However, typical deposition will occur in underground closed spaces. Even in air-raid shelters, if there are too many people lying on the ground, they are more likely to die, let alone a few hundred meters away. Deep superwell.
Wang Qi thought of many ways, including the Wangting tree absorbing part of the carbon itself, and then using a special biological pipeline to press the air to the bottom through layers of movable valves, but the effects were all limited.
The carbon collection part is generally made of leaves on plants, while the underground shelter is the root system of the Wangting tree. Although it is an artifact, we still have to talk about basic rules. The purpose of the tree absorbing carbon is to synthesize various resources, mainly starch. The synthesis process requires light as an energy source.
There is no light underground, so the leaves are forced to grow inside in the form of wallpaper, but carbon emissions (respiration) are required.
Baimeng book
I have thought about using geothermal heat instead of light, but Wang Qi's knowledge is a bit confusing.
The method currently used is to use the fiber light conductivity of jellyfish wood to introduce part of the light source, but it is not an optical fiber after all. Most of the light is scattered halfway. Although the ground looks dark, these scattered The light is enough for the Night Clan to see things clearly with black and white vision.
After going more than 300 meters deep and reaching the lowest level, the concentrated illumination can reach 20lx by visual inspection.
How low is the illumination? It can only barely suppress the respiration of the leaf wallpaper. This is because the organs of the Wangting tree itself do not have that high demand for light.
The carbon accumulation effect will not be counted, and it will certainly not be enough to satisfy everyone.
Before Wang Qi thought of a better way to improve light guide fibers, underground ventilation now mainly relied on valve ventilation systems. At a depth of 300 meters, even if a two-kilowatt motor with its own power generation unit appeared immediately, it would not be able to bring in too much fresh air. Send the air down.
Valve ventilation uses a compressed air method, which pressurizes the air chamber in each section and opens the lower valve to balance the air pressure between the two sections. As long as the air pressure in the lowermost section can exceed the air pressure in the deepest section, the air can be poured in.
The difference in internal and external air pressure formed by this system can make the underground a positive pressure space, and very weak wind will surge out at the entrance.
However, compressing air is still too difficult for plants. After several fine-tuning and upgrades of the underground part, it is still not enough for everyone to evacuate.
Wang Qi has considered using a steam engine to drive a wind wheel for air filling. The problem is that the steam engine itself burns fuel and consumes oxygen. It can only be installed on the surface. Everyone has to take refuge. What is the point of burning a steam engine on the surface?
In the future, we will probably have to resort to magic or electricity systems. Now that the comet is approaching, it is too late. We can only see if we can survive this wave.
