Empress Changsun seemed to see something wrong with Li Er and asked thoughtfully, "Erlang, what's wrong with you? Are there any discomforts?"

Faced with Empress Changsun’s concern, Li Er said with a wry smile: “Didn’t Guanyin maid see that the things Qingquan took out look familiar?”

After Li Er reminded me, Empress Changsun looked carefully again and carefully observed the hot air balloon. After a long time, Empress Changsun shook her head and said, "This concubine does look familiar, but she just can't remember what it looks like."

Li Er smiled bitterly and said, "Didn't Guanyin maid notice that the thing Qingquan took out is just a much larger Kongming lantern?"

When Empress Changsun saw this, she was really the case. She smiled and said, "The emperor must have thought Qingquan took a much larger Kongming lantern and took away the emperor's thousand taels of silver."

"Hey, the one who knows me is Guanyin maid." Li Er looked at this large Kongming lantern with a melancholy expression on his face, as if he had watched his thousand taels of silver drift away with the wind.

"The emperor doesn't have to think so. Although this thing looks like a much larger Kongming lantern, there are still many differences." Empress Changsun comforted Li Er.

"Oh, then Guanyin maid wants to tell me what's the difference?" Li Er asked.

"Do you still need to say this? Your Majesty, listen, this thing made a particularly loud noise when the thing on the Qingquan ignites the thing on it. I have never seen anything before. What can make such a loud noise when it burns."

When Li Er heard Queen Changsun say this, he heard the sound of the hot air balloon flying in the air making a particularly loud sound, but why didn’t he hear it just now? Maybe he was too fascinated by the fact that he was thinking about Qianliang Silver just now.

"And, please carefully observe the one that is on Qingquan. You must have never seen it before, especially when Qingquan was flying, I saw a big jar in the basket. I guess there was something burning in the jar to emit such a big flame. Moreover, the flame gathered but did not disperse. Didn't you notice it?" I have to say that Empress Changsun's observation ability is much better than Li Er, but it may also be that Li Er was thinking about his own 1,000 taels of silver.

"The Guanyin maid is really meticulous in observing it, and I haven't noticed this." Li Er praised.

"Your Majesty is so praiseworthy. In fact, this is just my guess. It is better for the emperor to let Qingquan come down and ask him carefully."

"Well, it's reasonable." After Li Er said that, he signaled Liu Bing to call Zhang Nan in the sky.

At this time, Zhang Nan's legs were so weak that he could not stand up. He could only sit in the basket and use his hands to reach the ignition device to operate. Zhang Nan could not operate the hot air balloon, so he would only go straight up and down. Moreover, Zhang Nan was not flying high, so he would not let the hot air balloon float away.

"Mr. Zhang, come down quickly, the emperor will let you down." Hearing Liu Bing's call below, Zhang Nan seemed to feel that he had heard the fairy sound. He had never felt that Liu Bing's half-manly voice was so beautiful.

Zhang Nan quickly turned off the fire and let the hot air balloon land steadily in the imperial garden. As soon as he stepped out of the basket, Zhang Nan's legs were weak and he was about to fall down. Fortunately, Liu Bing, who was standing beside him, was quick-eyed and helped Zhang Nan.

When Li Er saw Zhang Nan's appearance, he couldn't help laughing and said, "What's wrong? Our time traveler is afraid of the heights." Hearing Li Er's inexplicable mockery, although Zhang Nan's legs were already scared, he still said, "Your words are bad, and this is afraid that heights have nothing to do with me as a time traveler, right?"

When Li Er heard Zhang Nan shaking his legs and being stubborn, he would not pursue Zhang Nan's words like this. After all, this was for himself.

"Qingquan, I think you are just a bigger Kongming lantern? How dare you collect one thousand taels of silver from me?" Li Er pretended to be angry.

"Your Majesty, this is unreasonable. You really wronged me. Come on, look, you must have never seen this material or device." Zhang Nan was unwilling to hear Li Er say this. Although he made some money, he definitely gave Li Er a friendly price, but Li Er still said this, but Zhang Nan was unwilling to do so.

Li Er walked up and touched the material of the hot air balloon with his hands. He found that he had never seen this before, so he asked, "Qingquan, what kind of material is this? It's so strong and can't be burned with fire. It's really magical." Li Er touched the airbag with his hands, as if Elder Jinchi in "Journey to the West" saw the treasure robes.

"This is called thickened, high-temperature-resistant canvas, but this thing cannot be made in the Tang Dynasty, so don't think about it." Li Er was unhappy when he heard Zhang Nan say this, and stopped looking at this thing. Li Er was not interested in things that he could not create in the Tang Dynasty. If he could not create it, it would be like there was nothing. Without Li Er, he would not be interested.

"What about this? This looks so strange. What kind of metal is this? Is it meteorite?" Li Er pointed to the ignition device on the basket with his hand, and pointed to the air tank inside the basket and asked.

"This is made of alloy, and this thing cannot be made of the Tang Dynasty." Zhang Nan said that he felt a little embarrassed. He always said that the Tang Dynasty could not be made of it. Will Li Er be unable to be on his face?

As expected by Zhang Nan, Li Er hummed, walked to the basket, picked up the liquefied gas tank and shook it. He found that there was liquid inside, so he asked: "Qingquan, what is it in it? Is it tinder oil? Why do I feel like water?" Li Er put the liquefied gas tank next to his face and listened.

"This one contains gas." Zhang Nan thought for a while and said. Although he didn't understand it very much, he still understood the liquefied gas.

"Angry? What's the air?" Queen Changsun asked strangely.

"It is a kind of air we breathe in on weekdays." Zhang Nan said calmly. After all, the happiness brought by knowledge is still very pleasant.

"How can it become like water?" Li Er looked like a good student.

Zhang Nan didn't know why? He only knew that when the pressure reached a certain level, the gas would be converted into liquid. However, Zhang Nan didn't know how to explain the pressure problem to Li Er and Empress Changsun, as well as the conversion between gas and liquids, so he had to continue his old career, a charlatan.

"This, the secret of heaven cannot be revealed. Your Majesty, you think that this can convert the energy between heaven and earth into visible and touching water. Of course, this is against the will of heaven. I know too much, it's not good." Zhang Nan continued to pretend to be a charlatan.

Unexpectedly, this time the charlatan was so successful. Li Er and Empress Changsun nodded repeatedly and said, "Then you better stop talking."

Seeing the two of them, Zhang Nan couldn't help but feel a little funny.
Chapter completed!