Watching the dealers untie the airbags, Wang Ke stepped forward and opened the airbags by himself, Wang Ke didn't dare to fake this matter, these people did not have a problem doing things according to their own instructions, but if they wanted to observe any changes, it would be a little difficult for them, and they had to do it themselves. Wang Ke is still relatively clear about doing things, when it is time to do it himself, he will definitely not let others 'interfere', now is such a time, don't think about it, Wang Ke walked up.

After Wang Ke's careful inspection, Wang Ke understood that the drop of wax oil on his hand was dripped down after melting on the cloth near the chimney, which showed that the wax liquid could not withstand the high temperature, but far away from the chimney, it seemed that there was no change, which showed that as long as it was far away from the chimney, the hot air would gradually decrease, and the threat to the wax oil would also decrease a lot.

However, Wang Ke also understands that today's test flight is a short time, the time is short, and it can't fully explain the problem, for the sake of safety, he has to do experiments carefully to ensure that nothing goes wrong, after all, this thing is the first time to do, and he is not sure, and it is in the sky, it is not as good as on the ground, there is a problem on the ground, at least he can stand aside immediately, there is something in the sky, but there is no place to hide!

Wang Ke didn't know what he should do for a while, if every possibility was to make such a big object, the cost would be high, but shrink, he didn't know if the furnace could be reduced, this had to ask Li Ke, Wang Ke had no other way, he could only ask the housekeeper to put things away, and he turned around and went home, he had to call someone to tell Li Ke to come to him at night, so that he could discuss specific matters with him.

Back at home, Wang Ke didn't have time to call his subordinates, he saw Nanping walking towards him with Lanling and Dongyue, Wang Ke hurriedly walked over, picked up Xiao Wang, and gently tapped Xiao Wang's little nose with his fingers, making Xiao Wangqi giggle.

Nanping looked at the two fathers and sons, and asked Wang Ke softly, "General, how are today's results?" ”

As soon as Wang Ke heard Nanping ask about this, he suddenly lost the mood to continue to tease Xiao Wang, and his face sank. Dongyue knew that Wang Ke was in a bad mood now, so she sensibly hugged Xiao Wang Ke from Wang Ke's hand and walked aside with Lanling, leaving only Wang Ke and Nanping there to talk about things.

When Nanping heard that Wang Ke wanted to call Li Ke to come, he smiled lightly: "The general is really anxious to worship the Buddha in a hurry, where is the need to find the third brother in this matter, isn't the general thinking about shrinking to do experiments?" Wouldn't it be okay to replace this stove with candles, and don't they all need fire? This candle is not the same as it can be lit. ”

Although Nanping's words are not right, this fire is just to heat the air, but it still makes Wang Ke wake up like a dream, that is, it can be seen that it is a Kong Ming lantern, and when he was in the later life, he also made Kong Ming lanterns to play, isn't it a candle that is used? I was in a hurry just now, and I really forgot about it, if Nanping hadn't said it, I would really have to discuss with Li Ke stupidly how to shrink the stove.

Seeing Wang Ke's face 'showing' with joy and 'color', Nanping knew that his words had worked, and while Wang Ke was happy, Nanping hurriedly asked: "General, can you tell the concubine body, why can you light a fire to make this thing rise?" ”

Wang Kezheng was happy, and he didn't think much about it, so he told him the principle of what hot air is light, going up, cold air is heavy, and descending, Nanping was confused when he heard it, and he didn't understand what was going on at all. Wang Keyang talked for a long time, and as soon as he stopped, he saw Nanping staring at himself with two eyes, and at first glance, he didn't understand, and then he remembered that there was no natural science at this time.

Wang Ke couldn't help but pat his forehead, and said secretly in his heart: "God, there is no way to communicate at all, how can I talk to them!" ”

But this has been said, and I have to say it at the beginning, but these people don't understand it at all, where do you have to start with it! Wang Ke was a little speechless for a while, and he didn't know how to say it for a long time, but looking at Nanping's gaze looking at him, he really couldn't bear to prevaricate a few words casually, so he sent Nanping over.

Just when Wang Ke was embarrassed, Wang Ke's eyes suddenly stayed on the candlestick in the corner, Wang Ke was happy, he remembered an experiment he had done in junior high school, and hurriedly pulled Nanping to the candlestick, found a piece of thin paper, and lit the candle on the candlestick.

Wang Ke lifted the piece of paper in his hand upside down with two fingers, let the piece of paper hang upside down in the air, and then said to Nanping: "Look, there is no wind here now, and this note has not moved. Right? ”

Nanping didn't know what Wang Ke meant, but he also saw that the note was indeed motionless, so he nodded and waited for Wang Ke to continue.

Wang Ke moved the small note towards the candlelight and said, "Now let's put the note above this fire and see what happens." ”

As soon as Wang Ke's words fell, Nanping shouted in surprise on the side: "It's moving, it's moving, how is it possible, this note can be moved without wind, it's amazing!" ”

Seeing that the goal had been achieved, Wang Ke blew out the candle and said, "Yes, why is there no wind, but this note moves?" Actually, it's the air that's at work! When we lit the candle just now, the air around the candle was heated, but because we didn't collect it, it was very little heat compared to the more unheated air around it, so it could only make the note move gently. And the hot air balloon we are going to make now is to gather this hot air together, because the air is heated and expanded, it becomes lighter than the cold air that is not heated, and we all know that very light things will rise upward, so we use this to make the hot air balloon that we make to rise into the sky. ”

As soon as Wang Ke finished speaking, Nanping asked again: "Then what is this air, why haven't you seen it before?" Mobile access: ap.ㄧб Κ.Сn"

Wang Ke is really a little exhausted now, who has seen this air, but he has to explain, but how to say this, he can't see it, he can't 'touch' it, and he really can't say it clearly. Wang Ke decided to use something as a metaphor, lest he talk for a long time, and the more he talked, the more he listened, the more confused he became.

Wang Ke is really not very sure about explaining this problem clearly, after all, this problem is really a bit big for people in this era, and after thinking about it for a long time, Wang Ke came up with a solution.

Wang Ke led Nanping to the 'door' and stood quietly under the eaves, Nanping didn't know why Wang Ke was doing this, but he also understood that Wang Ke's move must have a deep meaning, and he didn't ask much, just followed Wang Ke to stand there.

A gust of wind blew, and Wang Ke hurriedly said, "What was it just now?" ”

Nan Ping replied incomprehensibly: "Wind, it's just a gust of wind!" ”

Wang Ke nodded: "Yes, it's the wind, but how does this wind come from, this is the formation of air flow." We can't see or 'touch' the wind, but we can feel it because it's transparent, and that's the way air is, and we can only feel it when it flows so quickly that it forms the wind. ”

Nanping heard yes and no, but Wang Ke had no choice, what he knew was almost finished, and if he wanted to continue, he couldn't explain it again. Just when Nanping was still thinking there, Dongyue ran out and beckoned the two of them to go in for dinner, and Wang Ke felt relieved.

He was really afraid that Nanping would ask himself endlessly, then he was really 'desired' to cry without tears, and there was no way to explain it! The best way for Wang Ke now is to make a few Kong Ming lanterns after eating, so that the people in the family can see that this thing can ascend to the sky, which is much more effective than saying that it will take half a day.

After dinner, Wang Ke took out a few pieces of fabric and made a few Kong Ming lanterns. Watching Wang Ke walk out, the family followed out, and even Wang Si, who had always returned to his study directly after dinner, also made an exception to stay today, wanting to see how Wang Ke made this thing to ascend to the sky.

When he came to the courtyard, Wang Ke tied a thin rope to each Kong Ming lantern, now is not the time to play by himself, now he is doing an experiment, and he will have to take it back after a while, to see if the wax-soaked cotton cloth and linen can be used, if he just lets it go, how can he see the results of this experiment?

Watching the two Kong Ming lanterns staggering into the sky, the family unconsciously let out an exclamation, only Wang Si pondered for a while before sighing: "The old man used to see this Kong Ming lantern in the book, and he really didn't see what it looked like, but I didn't expect to finally see it today, there is such a magic!" ”

Wang Ke heard Wang Si's sigh, but he didn't have time to deal with Wang Si, he just cared about silently reciting the time in his heart, as soon as he felt that the time was about the same, Wang Ke hurriedly recycled the string in his hand, and after a while, he took back the two Kong Ming lanterns, at this time Wang Ke was really nervous, he was really afraid of the worst result he thought of in his heart, if that was the case, he would have to 'spend' more 'fine' effort to come up with a substitute for this wax liquid.

If that's the case, I don't know if this alternative is feasible, and if so, whether the cost will increase, these are all factors that affect whether the hot air balloon can be successfully put into use!

Turning around and returning to the house, Wang Ke didn't care who to say hello to, so he sat on the sofa and looked at the two Kong Ming lanterns in his hands over and over again.

After Wang Ke's careful inspection, Wang Ke's heart was relaxed. He has seen that there is no problem with the use of wax immersion, now it is just to consider how to protect the entire lower edge of this circle, because this circle is closest to the heat source, so the heat of the wax here is also the largest, other places because it is only in contact with hot air, and the temperature of the hot air is not too high, and there is no effect, and the closer to the heat source, the greater the heat received, the melting point of this wax is low, so it is melted by the high temperature, and the wax oil dripping down during the day today, That's what it should be.

Wang Si saw Wang Ke staring at Kong Minglan without saying a word, knowing that Wang Ke had encountered a problem, he couldn't help but feel a little anxious, and said in a hurry: "Ke'er, is there anything difficult?" Can you talk to your father, one person counts short and ten people count long, say it, let's all help you think about it! ”

Wang Ke told him what the structure of the hot air balloon is now, focusing on what problems he is encountering now, and explained it again with the Kong Ming lantern in his hand, and everyone immediately knew what was going on. After Wang Ke finished speaking, he looked at Wang Si with blank eyes, to see what kind of advice Wang Si could give himself, but he saw Wang Si's brows tightly locked, and he didn't say a word for a long time.

When he was disappointed, he heard Mrs. Wang say on the side: "Why do you think it's difficult, isn't it that your chimney is too hot and melts the wax oil?" What else can you think about such a simple thing! ”

Mrs. Wang's words were like giving Wang Ke a shot in the arm, and Wang Ke jumped in front of Mrs. Wang immediately, and urged repeatedly: "Mother, how to solve it, you can say it quickly!" ”

Mrs. Wang patted her chest and said, "Ke'er, you are scared to death for your mother, why are you in a hurry, let your mother tell you slowly." ”

When Wang Ke saw Mrs. Wang like that, he was really frightened by himself, and hurriedly said with a smile: "Mother said slowly, the child is not in a hurry." ”

Mrs. Wang glanced at Wang Ke dotingly before she said slowly: "I don't know what kind of cigarette holder you have, but my mother knows that if this bowl of soup is so hot that your hands can't hold it, you will use a piece of cloth or something to put it on, and your hands won't feel hot, and you should be able to do this too!" ”

After Mrs. Wang finished speaking, Wang Ke jumped up, such a simple reason, why didn't she think of it, as long as the part of the cigarette tube that touches the airbag is wrapped, isn't this problem solved? I don't know what I'm doing for a day, and I didn't think of such a solution!

Seeing Wang Ke jumping and jumping there with a smile on his face, everyone knew that this problem had been solved, and for a while, everyone's hearts that were still hanging just now suddenly fell.

Wang Si asked tentatively: "Ke'er, now the problem is solved, can this hot air balloon be made?" ”

Wang Ke nodded desperately to say that there was no problem, and Wang Si smiled with relief: "Then hurry up and make it, and when the time comes, I will try what it is like to be in heaven for my father!" ”