Song Qingshu was surprised: "what do I owe you?"

The yellow dress girl opened her mouth, but she didn't say anything. Instead, her face was slightly red. After a long time, she whispered, "you also told me how to call the wind and the rain last night."

Song Qingshu then remembered that she even gave a kiss to herself for the answer last night, and covered the place where she had been kissed last night. She couldn't help giggling.

"Don't laugh!" The girl in the yellow shirt can't help but feel annoyed.

"Well, well, don't laugh," Song Qingshu said hastily, seeing that the woman in front of him had a tendency to turn into an angry female leopard. "Since I've received the reward, I won't deny it."

Huang shannu's face softened slightly, but when she thought of the reward in his mouth, she felt uneasy.

Song Qingshu cleared his throat and began to explain: "do you know the principle of rain?"

Huang Shan Nu Xiu Mei slightly frowned and shook her head. Although she knew that Lei Gong and Dian Mu were just myths and legends, she really didn't know how it would rain.

Song Qingshu explained with a smile: "when the sun shines on the earth, water vapor rises from the sea and lakes and becomes part of the air. When encountering cold air at high altitude, it condenses into small water droplets. These little drops are so small that they are invisible to the naked eye. They are small and light. They are held in the air by the updraft in the air. They gather together to form clouds. "

"Are clouds formed by water vapor?" Huang shannu can't help but ask, what kind of updraft? Listen to her in the clouds. People in this world always think of the cloud as a mysterious thing, which is often associated with various myths and legends. How do you know that the cloud is actually ordinary water vapor?

"Of course, I've been to the clouds." Song Qingshu can't help but think of the picture of crossing the clouds with the East dusk snow on the Blackwood cliff. He can't help but feel a trace of tenderness on his face.

Huang shannu subconsciously thinks that he is bragging. After all, in common sense, only immortals can fly in the clouds. But when she thinks of the scene that he went up to the sky step by step last night, she can't help sighing: "yes, it's not difficult for you to go up to the clouds in your lightness skill yesterday."

After imagining what the other person described, she suddenly frowned and said, "as you say, the clouds are full of water droplets, so why don't the water droplets fall down?"

"I just said that the small water drops are so small that you can't see them," Song Qingshu explained. "The raindrops you see on weekdays are more than one million times larger than those small water drops."

"A million times?" The woman in the yellow shirt changed her face. I can't imagine what a million times is like.

Song Qingshu explained to her: "those small water drops are also called cloud drops. They mainly rely on constantly absorbing the water vapor around the cloud to condense and condense themselves... Er, what is condensing? You can imagine yourself growing up... If the water and energy sources in the cloud are constantly supplied and replenished, so that the surface of the cloud droplets is often in a supersaturated state, then this condensation process will continue, making the cloud droplets continue to grow. "

"When the cloud drops increase to a certain extent, due to the increasing volume and weight of the large cloud drops, they can not only catch up with the slower small cloud drops, but also" swallow "more small cloud drops to make themselves grow up. When the big cloud drops grow longer and bigger, and finally the air can no longer hold them, they will fall straight from the cloud to the ground, which will become common rain and eventually become raindrops. "

Huang shannu nodded her head as if she knew nothing. Thanks to her full reading of poetry and her intelligence, she still understood the general principle though she still didn't understand many details.

"But..." Huang shannu suddenly thought of something and looked at Song Qingshu with burning eyes. "As you said, only when the cloud drops are big enough can it rain, but how did you control the time of rain so skillfully yesterday?"

"Thanks to your help." Song Qingshu said with a smile.

"Me?" The yellow dress girl blushed, "what did I do for you?" She thought to herself that she didn't even know the principle of rainfall. How could she help you.

"Have you forgotten the bag you found for me yesterday?" Song Qingshu's eyes are full of smiles.

"That bag of salt?" The yellow shirt girl's red lips were wide open, "is that bag of salt used for rainfall?" When she heard the other party's request yesterday, she was at a loss. However, out of trust, she found it for him. Later, she experienced the shock of his soaring into the sky and calling the wind and rain. This little thing was soon forgotten. She didn't think it would be related to the rain.

"Or shall I take it?" Song Qingshu continued to explain with a smile, "just now I have talked about how rainfall forms, but there is still one key problem that I haven't said, that is, how water vapor forms small drops in the beginning."

"How did it come into being?" Huang Shan's daughter was already confused at this time. She asked in a totally reflexive way.

Song Qingshu replied: "water vapor must accumulate around fine particles such as dust to form water droplets or ice crystals. These micro dusts are very small and can't be detected by the naked eye, but without them, although there is enough water vapor in the air, it is impossible to form a drop of rain. "

"So you use salt instead of dust?" Bing Xueming, a woman in yellow shirt, was clever and soon drew inferences from one instance.

"That's right," Song Qingshu nodded. "When I got to the clouds, I used my power to spread the fine salt evenly. The water vapor in the clouds had condensation nodules, and the speed of rainfall was greatly shortened..."

Song Qingshu said that he suddenly found that the girl in yellow shirt was staring at herself, and he couldn't help laughing: "do I have flowers on my face?"

Huang shannu's face turned red. She quickly shook her head and said in a low voice, "I didn't understand what it means to study heaven and man before. Today, I've finally seen you. You are not only excellent at martial arts, but also so knowledgeable..."

"These skills are not worth mentioning," Song Qingshu said with an air of solemnity. "In fact, my greatest advantage is that I am handsome and graceful, and I have a jade tree in front of the wind."

Huang shannu looked at him with admiration. She thought that he would tell us something about the past and the present. She didn't expect such an answer. She couldn't help but spat with a red face: "you are always so unruly ~"

The bookseller of Song Qing said, "look at your face just now. If I'm serious, you'll worship me as a teacher. I don't want you to call me Shifu."

"What do you want me to call you?" The yellow dress girl opened her mouth, but she didn't say it after all, with a faint smile on her face: "in fact, I really wanted to invite you to the academy to teach those students."

"Never!" The head of Song Qing's book shakes like a rattle drum. "What you learn in your academy are all books of sages and sages, which are used to test your fame and fame. They don't want to learn these physics knowledge in vain."

Thinking of the fanatical nerds in the Academy, Huang shannu nodded subconsciously: "not bad."

"Besides," Song Qingshu said with a smile, looking at the girl in the yellow shirt, "those students in the academy are basically your fans. If I know our relationship, I will not be attacked by others."

"Bah!" Yellow shirt female face a red, can't help but light spat a, "I and you can have what relation."

"The relationship between sleeping in the same bed and kissing..." seeing that Huang shannu's face was getting darker and darker, he quickly changed the topic, "cough, I've told you the secret of the rain. Should you repay me for my help?"

---

The eight Dragon Boat Festival, which is the practice of the god dragon, is from the kingdom of mortuto, which is a beautiful and beautiful princess of the kingdom of mortuto on the official account.

But what I'm most interested in is the actor of Laurie Murong Qiudi. Up to now, no one knows his name?