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Chapter 600 Boarding the hot air balloon

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    The hanging basket of the hot air balloon is very huge and adopts a two-story structure. The upper level is used to operate the various equipment of the hot air balloon, and the lower level is the living area. It is like hanging a two-story building.

    Can this thing fly?  The outcome is about to be seen today. Many people are gathered to watch the excitement. There are craftsmen and their families, as well as relatives of the emperor who have nothing to do. Even Li Shimin came here specially. After all, if the takeoff is successful this time, mortals can  Conquering the sky is of great significance.

    This thing can also be used in the military. Maybe in the future Datang can directly use airdrops to send troops.

    Of course, Li Shimin did not allow Yunyao to take risks, so the first batch of hot air balloon users were selected craftsmen.  Yunyao told them that if they succeed, they will be remembered in history, and if they fail, they will receive pensions for their families, so these five craftsmen started operating the hot air balloon without hesitation.

    When everyone saw the hot air balloon getting bigger and bigger, their eyes widened in surprise. When they saw the balloon lifting the two-story building, their jaws dropped.

    Huang Bixia also grabbed Yunyao's hand nervously. Although she knew about the princess's plan three years ago, she always thought that there was no possibility of taking off. She never expected that right in front of her, today, it turned out that  Hot air balloons can really take off with heavy loads.

    It¡¯s just that the cable has not been released yet, so the hot air balloon does not fly directly to high altitude, but only tightens the cable to float at low altitude.  But this is already shocking. It is still three feet high, almost catching up with the city wall of Chang'an City.  Flying higher, he could overlook Chang'an. Li Shimin could only sigh that his daughter had surprised him so much. He didn't even understand the principle. He only heard students from the Imperial College explain that hot air goes up and cold air goes down.  .

    Li Shimin also asked at that time: "Why is it colder at the top of the mountain than at the foot of the mountain? If the hot air goes up and the cold air goes down, then the top of the mountain should be hotter than the foot of the mountain?"

    But science is contrary to common sense. Although it is indeed colder at high altitudes and warmer on the ground, hot and cold air move in the opposite direction to human cognition.  The students of the Imperial College explained that the foot of the mountain was warm because they were close to the ground and the temperature on the ground was warmer.  The top of the mountain is farther away from the ground, so it is colder. Simply put, the temperature obtained by the earth mainly comes from the storage of the ground, rather than direct sunlight.

    Li Shimin didn¡¯t understand it at the time, but now it has been proven that hot air moves upwards, so as long as the hot air is wrapped around it, the hot air can lift heavy objects up to the sky.  At this time, a little bit of scientific spirit suddenly appeared in Li Shimin's mind, and he couldn't help but said to himself: "That day when Guanyin Bodhisattva flew away on a cloud, were those clouds also hot air?"

    If it is hot air, it will not hold up the soles of the Bodhisattva's feet, but the bottom of the skirt.

    The students at the Imperial College were also very excited. This is science, it¡¯s amazing.  They are also responsible for explaining to Li Shimin how the hot air balloon works, how to fly up and how to fall down.

    Falling down is to release the hot air. There is an outlet at the top of the hot air balloon. As long as the hot air is released, the height can be reduced.

    In short, today the people of Chang'an all saw a huge thing beyond the city wall outside the city, just like a huge round head. It was really novel and interesting.

    Several generals also said that with a hot air balloon and a telescope, they could see thousands of miles away.

    Li Shimin could no longer hold himself back and decided to go up in person.  Although there was danger, the ministers all knew that Li Shimin was not afraid of danger, so they also rushed to be the first, saying that they would follow the emperor into the sky bravely.

    Yunyao thought to herself that this was not a toy. She was going to travel west in a hot air balloon, but such a novel thing was too attractive to mortals.  Yunyao could fly before, so she no longer had any curiosity about high altitudes. But this was the first time for a mortal to set foot on such a high altitude. How could he not be excited and curious?

    Still did not loosen the cable, but Li Shimin was already very happy. He and several ministers stood in the fence on the second floor and looked far into the distance.

    "Hot-air balloon." Li Shimin even waved his hand on the hot-air balloon and wrote three words, which was regarded as a formal recognition of the greatness of the hot-air balloon. Then Shi Xingdafa wrote a poem: "Chang'an is surrounded by mountains, and Qujiang City flows  , If you want to see a thousand miles away, board a hot air balloon."

    Everyone agreed, but didn¡¯t they just want to see a thousand miles away and board a hot air balloon?  It's so appropriate.  The emperor is really both civil and military, and his writing is full of flowers.

    Li Shimin was also very happy. He rewarded the craftsman who controlled the hot-air balloon for him with a hundred gold. He also wanted to put the hot-air balloon in the palace. In the future, he could climb up in the palace and overlook Chang'an when he had time. It was also a kind of fun.  So he came down and said to Yunyao: "Good daughter, dad is very fond of hot air balloons. This hot air balloon will be sent to the palace so that I can overlook Chang'an in my free time. It will also help me care about my people and the country.  "

      It¡¯s obviously just for fun, but does it have anything to do with Sheji Jiangshan?

    Yunyao could only say: "Father, this is the first hot air balloon and there are still many shortcomings. If my father needs a hot air balloon, then I will definitely develop a second generation of safer and more comfortable hot air balloons for my father."  The emperor uses it.¡±

    Li Shimin thought it made sense when he heard it. The first generation definitely needs improvement, and the second generation is definitely better than the first generation.  So he accepted this argument and said: "Then I will wait for you to develop the second generation hot air balloon, but don't keep me waiting."

    Yunyao immediately said: "In order to develop the second generation of hot air balloons as soon as possible, I think the first generation of hot air balloons need to be used more and accumulated experience. So I decided to take my consort with me, take the hot air balloon back to Jiannan Road to visit relatives, and also invited my father  The Emperor¡¯s favor.¡±

    Li Shimin knew that Yunyao liked the Prince Consort very much. Without a hot air balloon, it would be difficult to go back to Jiannan Road to climb to the sky. But now that he has climbed to the sky, he really should go back to the Prince Consort's hometown to visit.  So he thought for a while and nodded in agreement: "Okay, but you must pay attention to safety, and you are not allowed to run around. You will come back after visiting your relatives in Jiannan Road. You must not miss the people with your consort, you know?"

    "My daughter knows." Yunyao said that she had pointed out that in Chang'an City, she would not only run away, but also run to Tianzhu if the foreign emperor's order was not accepted.

    "When are you going to leave?" Li Shimin asked.

    "Five days later. The use of hot air balloons is very important to the weather. I have invited the famous divination master Yuan Shoucheng from Chang'an to accompany me. Divining the weather along the way can ensure safety." Yunyao was not lying. The weather predicted by Yuan Shoucheng was as good as  The arrangements in heaven are exactly the same and are more accurate than the weather forecast.

    Seeing that his daughter had considered everything carefully, Li Shimin was relieved to let his daughter go on the road. When the child grows up, he has his own plans, and parents cannot tie their child around forever.

    Soon everyone knew that Princess Li Zhuyun of Dancheng was going to take her first hot air balloon ride, and newspapers reported the news of this flight to Jiannan Road.  There have been records of the difficulty of the road to Shu since ancient times. It has not been easy to enter Shu since ancient times. But now with hot air balloons, everything is simple. If it goes well, we can open up a new route to Shu, and maybe we can enter and exit in the future.  The land of Shu is full of hot air balloons.

    If it succeeds, the princess will really have great merits. Many Chang'an residents think that it is really amazing that the princess is willing to take risks despite her rich body.  When other members of the royal family saw that Yunyao was so prominent, they were all envious and wished they could get a piece of the pie.

    Anyway, the hot-air balloon workshop is just outside Chang'an City. When the time comes, they will produce new hot-air balloons and they will become famous by flying everywhere.

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