If you want to artificially change the celestial phenomena and create a rainstorm that covers most of the city, you must first understand how the rainfall is formed.

Constantly recalling the knowledge he had learned in the past, Xu Yue looked at the clouds floating around him, and reached out to help a ball of white cotton wool like a marshmallow, but he didn't feel any touch, only wet and cold, and when he withdrew his hand, his palm was already covered with small droplets.

The so-called cloud, which is essentially a large amount of water vapor in the high altitude after encountering cold air, the water vapor will condense into small water droplets due to the cold, and the diameter of these small water droplets is generally only about 0.01~0.02 mm.

The small size of these water droplets allows them to be supported by air currents in the air, thus floating high in the air, and when a large number of small water droplets come together, they form the clouds that we commonly see.

As for the formation of rainfall, it is the volume of a large number of small water droplets in the clouds that increase after fusion or adsorption, and when the volume weight reaches a certain level, the updraft cannot support it, and the water droplets will fall from a high altitude under the action of gravity, causing rainfall.

To sum up, it is not difficult to achieve artificial rainfall, and only the above two conditions need to be met.

The first is sufficient water vapor, which is the basic condition for the formation of rainfall.

The Earth Dragon Kingdom is bordered by the Chaotian Mountain Range in the west, and the large amount of water vapor blocked by the tall mountain range makes most of the territory in a state of sufficient water vapor and abundant water resources, so the clouds in the sky are deep all year round, otherwise there is no way to hide such a huge volume of the Chasing the Sun.

Xu Yue stood on the deck of the Chasing Sun, a pair of purple demon wings behind him spread out, driving him into the sky.

His wings swept up the wind and waves, and after a single climb he reached the height of the clouds, and he frowned slightly as he looked down at the fluffy and rolling clouds below.

Clouds can generally be divided into two categories: cumulus and stratus, of which the rain formed by thick and large cumulonimbus clouds is the most violent, and can even cause thunderstorms.

Now the clouds in the high altitude are fluffy and white like cotton wool, from the morphological point of view, this is obviously the most common cumulus cloud, although such clouds also meet the basic conditions for rainfall, but it is far from meeting the requirements that Xu Yue wants.

Therefore, he also needs to manually replenish a large amount of water vapor, and as for how to replenish it, he already has a draft in mind.

The first condition is satisfied, and then the second condition is that in addition to water vapor, in order to induce rapid rainfall, it is also necessary to find a way to promote the rapid condensation of water droplets in the clouds.

The most common way to do this is to throw a large amount of dry ice, silver iodide, salt and other catalysts into the clouds, which will cause the water vapor in the clouds to cool and form a large number of ice crystals, which are the best condensation nuclei and allow water droplets to gather to form rainfall.

However, in the Earth Dragon Country, a country similar to an ancient society, it is basically impossible to collect special substances such as dry ice and silver iodide, and there is no condition and material basis for large-scale synthesis, so he can only use a more cruel method to trigger a large-scale forest fire, at the cost of burning the entire forest, producing a large amount of upwelling smoke and dust as the condensation nucleus of the clouds, so as to cause a rainstorm.

High in the clouds, after reorganizing his plan and determining that it was generally feasible, Xu Yue's figure fell backwards with a backward tilt, and when his wings flapped, he turned into a purple line of fire and fell straight to the ground, he still needed to go to the capital of the Earth Dragon Kingdom before realizing the plan.

The name of the capital of the earth dragon is the city of no blame, which was renamed together when the Protector Divine Beast was established fifty years ago, and its intention came from the ninety-four yao of Zhou Yiqian's hexagram - or leaping in the abyss, without blame.

The rough interpretation is: the dragon either leaps into the sky or stays in the abyss, as long as it moves forward according to the needs of the situation, there will be no mistakes.

At that time, the people of the Earth Dragon Kingdom had high expectations for the Protector Divine Beast Long Yuan, hoping that it could lead the Earth Dragon race to completely transform into an underground true dragon, and even the entire country would benefit from it, but they were also afraid that a series of backlashes caused by the defeat would cause the entire country to fall for it.

Therefore, they named the divine beast Long Yuan, and renamed the national capital as Wu Blame, intending to warn themselves that when they were about to jump, they must not act recklessly, but should conform to the situation and advance and retreat with evidence, so that whether it is a success or a failure, it will not cause too serious damage.

Unfortunately, as 50 years have passed, the ancestors of the previous generation have slowly grown old, and the new generation in power seems to have no one to remember these instructions, and only more and more ambitions remain.

From the foreign trade that has increased in price year by year and the biological geneticists who have secretly contacted the Sturt Country, it can be seen that the current Earth Dragon Kingdom has begun to impatient.

At the main gate of the national capital, Xu Yue looked up at the word 'no blame' on the plaque of the city gate, and a trace of ridicule flashed in his eyes.

Entering the city, the wide street is full of people coming and going, the shops on both sides are selling in an endless stream, so lively, although the architectural style here is also such as the ancient Chinese architecture of the Xuanwu Kingdom, but it seems to be a lot more lively, the pedestrians are no longer the warriors with swords and swords, but the merchants and scholars who are mostly brocade clothes and jade belts.

The developed agricultural output has made the handicraft industry of the Dragon Kingdom equally excellent, the abundance of raw materials such as tea, mulberry and silk has made the development of commerce extremely fast, and the comfortable and peaceful living environment and rich and diverse material resources have also made the atmosphere of the whole country tend to be relaxed.

After wandering around the streets of the national capital for a few laps, Xu Yue also had a general impression of this blameless city, the force value is not high, and the vigilance is even more lacking, in the implementation of the plan, these people should not cause much trouble, but the unknown Stern country biogeneticist is a potential risk factor, should be paid attention to.

Now that the enemy's intelligence had been largely assessed, he wasted no time on it, turning around and walking straight towards a pawnshop on the corner of the street, where the Shadow Order's covert point of contact in the city of Blameless was located.

As a worldwide Assassin organization, Shadow's contact points are located in major cities in every country on the continent, and the location map of these points of contact has been given to him by the leader's mechanical servants when he became a Shadow Assassin.

Push open the door of the pawnshop, facing a landscape screen, around the screen is a high mahogany counter, behind the counter is a thin old man is playing with the abacus, the crisp tapping sound of the abacus gently echoes in the store, Xu is noticed the footsteps, the old man stopped the movement in his hand, looked at Xu Yue who entered the door, and said with a smile:

"This guest officer, but you want to pawn something?"

Xu Yue didn't reply, just turned over and took out a square token and handed it over, this token was still handed over to him by Gu Yu when he was in Xingyang City, and until he got the token of 'Qi', this thing will always be his identity proof.

Behind the counter, the moment the old man saw the token, the smile on his face instantly became serious, he stretched out his hands and respectfully took the sign handed over, and began to look at it carefully.

This thing is a proof that only the top 100 assassins in the organization can equip it, and he can't be disrespectful, in this small and remote country with low national power, such big people are not common.

His gaze first swept over the most conspicuous shadow organization logo in the center of the token, which was a pattern composed of three fishhook-like patterns circling each other, and his fingers brushed the pattern around the pattern, and after making sure that it was correct, the old man looked at a font circled by gold coils above the logo, with a salary word on it, and a fire word on the other side of the token.

'Flame...'

Silently reciting this somewhat familiar code name in his heart, the old man's body shook, and his face turned white at first, but quickly became flushed.

A message came to his mind that had just come out of the Xuanwu Kingdom headquarters a few days ago, announcing all the members of the organization.

Since the Chief's mutiny, another Shadow Assassin has been born, destroying the Asuka Gate and defeating the Immortal Blackbird, and this Shadow Assassin's code name is Xinhuo.

"My lord, you wait, you wait."

(End of chapter)