Dongfang Bubai was instantly stunned. Usually, when the disciples spoke to her, they would be filled with fear and trepidation, and they would not even dare to raise their heads. But now, Song Qingshu …
But soon, the anger in her heart was washed away by the surprise of flying on a sword. She hung herself on Song Qingshu's body and widened her phoenix eyes. She looked like a newborn baby as she sized up the blue sky and white clouds, as well as the forest under her feet that was rapidly moving backwards. Even though her lightness skill could be said to be unparalleled in the world, she could not fly freely in the sky like this.
"If you can bring me to touch that cloud, I'll forgive … your actions just now." Song Qingshu was trying hard to control their balance when Dongfang Bubai's voice suddenly traveled into his ears. He looked up and saw her pointing at a white cloud not far away with her slender and fair finger.
"It's just a ball of saturated water vapor. What's there to touch?" Song Qingshu mumbled, but he still controlled his wooden sword to fly in that direction.
"I actually managed to touch a cloud?" When Song Qingshu brought her into the cloud, Dongfang Bubai seemed to be in slight disbelief. Her eyes were filled with white. She extended her hand to touch it, but she could not grab anything corporeal. She only felt that it was wet, and it was incredibly illusory. "I always thought that clouds were soft, like cotton candy …" When she thought about the daydreams she would occasionally have when she looked up at the sky, Dongfang Bubai felt that she had been very foolish at that time.
Suddenly, she felt a great movement, and Dongfang Bubai was so shocked that she wrapped her arms around Song Qingshu's neck. "What happened?"
Song Qingshu broke out in cold sweat. He gritted his teeth and said, "We might … crash."
Right when he finished speaking, the two of them fell straight down. Song Qingshu felt that the true qi in his body was intermittent, and his body was alternating between hot and cold. He was terrified. 'Could it be that I've entered spirit energy deviation?'
He tried his best to control the speed of his descent and began to glide. After descending a few hundred meters unsteadily, Song Qingshu could no longer control himself, and the two of them directly fell to the ground.
Fortunately, during this period of time, Dongfang Bubai had already recovered some of his qi. At that moment, he was not too high from the ground. She noticed that the true qi in Song Qingshu's body had become chaotic, and she quickly let go of her arms around his neck. With a flip of her arms, she held him in her bosom. She noticed that there was a pool below them, and she circulated her qi to continuously strike the surface of the water with her palms. She used the rebound to negate their falling momentum.
However, the force of their fall was more than one thousand kilograms. When he sensed the rebound coming from the water, Dongfang Bubai coughed up a few mouthfuls of blood. With a bang, the two of them sank into the pool and fainted.
When Song Qingshu woke up, he realized that he was lying on a gravel stall. Hearing the sound of water nearby, he walked towards the source of the sound and saw Dongfang Bubai sitting on a rock by the shore. She lifted the hem of her dress, and a pair of crystal white calves were soaked in the water. There was a long and narrow wound on her calves, and blood was continuously seeping out. Dongfang Bubai was using a handkerchief to gently clean the area around the wound.
The surface of the water was sparkling, and Song Qingshu could not see clearly. He only felt that the skin on Dongfang Bubai's calves was even more dazzling than the surface of the lake. It was rare to see Dongfang Bubai.
For a moment, he was afraid of startling her with her gentle and quiet appearance.
Dongfang Bubai soon noticed his arrival, and very naturally put down the hem of her dress and stood up. "You're awake?"
"I'm really sorry that you suffered such a superficial wound." Song Qingshu glanced at her calves, and his face was full of apology.
"This is nothing." Dongfang Bubai shook his head indifferently. "You've given me enough surprises today. Why don't you tell me how you managed to control the sword and fly?" Dongfang Bubai thought of the carefree feeling they had when they traveled in the sky, and for a moment, he was a little dazed.
"There's no harm in telling you, but I'm afraid you won't understand." Song Qingshu looked hesitant.
When Dongfang Bubai heard this, his face turned cold. "In terms of martial arts talent, even if I'm not the best, I'm definitely in the top three. Do you think I won't understand?"
"Alright then, listen carefully." Song Qingshu revealed a playful expression and explained slowly, "When I carried you and flew on the wooden sword, the air flow in the air would go around the bottom surface of the wooden sword and the top surface. The bottom surface of the wooden sword is a flat surface, and the top surface of the wooden sword is you and me. Just now, I deliberately controlled our bodies to maintain a streamlined angle with the sword so that the speed of the air flow through our bodies is much faster than the speed of the air flowing through the bottom surface of the wooden sword. Based on aerodynamics and Bernoulli's Law, when the liquid flows through a certain surface, the faster it is, the less pressure it will have on the surface. So when the air flows through the bottom surface of the wooden sword, it will have an upward force on the wooden sword, and this force is greater than the downward force on the wooden sword when the air flows through the top surface of the wooden sword. This counteracts our own weight, and that's why we can control the sword and fly."
In truth, when Song Qingshu went up Blackwood Cliff and flew over the lake, he realized that as long as he was fast enough, he could even float on the surface of the water. Hence, he had been thinking hard about how to use the power of the water to truly cross the river on a reed.
Originally, his thoughts had been stuck in the realm of martial arts, and he hoped that he could fully understand the power of water. But the more he thought about it, the more his head hurt. Then, one day, he had a flash of inspiration, and he remembered the principles behind flying planes in his previous life. Coincidentally, his company had done a project on planes in his previous life, and when he was researching related information, he had read about it to a certain extent. That was why he thought of using aerodynamics to solve the problem of controlling the sword and flying.
"Aerodynamics? Bernoulli's Law? " Dongfang Bubai frowned and asked in puzzlement, "Which sect's martial arts manual is this? Why have I never heard of it?"
"This?" Song Qingshu was instantly stumped, and he could only say, "This is a secret manual from a physics sect in the far west. It's only natural that no one in the Chinese plains has heard of it."
"Physics sect?" Dongfang Bubai sank into deep thought. He suddenly raised his head and asked, "Based on what you said, does the reason why we can fly have something to do with speed?"
"It's a pity that you don't study physics." Song Qingshu looked at her in surprise and nodded. "That's right. You can understand it in simple terms. Which sect is Bernoulli from?
The greater the speed, the greater the lift force from the air. "
"Oh …" Dongfang Bubai's eyes were filled with excitement. He raised his head and looked at the sky. "Then, doesn't that mean that as long as I'm fast enough, the lift force from the air will be much greater than my own weight? Then, won't I be able to keep rising and become an immortal?"
"You're thinking too much." As a modern person who knew that the world outside Earth was a cold universe, Song Qingshu did not quite understand why Dongfang Bubai was so interested in becoming an immortal. "When you fly faster than the speed of sound, the air will become sticky, and you will have to consider the Reynolds number. It's not as simple as I said just now … Of course, if your speed can reach the speed of the first universe, it's not impossible for you to become an immortal. But while you're flying, you'll be burned to ashes by the friction with the air."
Dongfang Bubai was confused, and he said angrily, "Then tell me directly, is it impossible for me to become an immortal?"
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