Chen Yajun shook his head gently: "That's not true, I have traveled to a tribe before, watched them perform, and the director explained to me that if you don't have special tools and no experience, if you want to make fire by drilling wood in the wild, it's basically impossible." Even if someone can succeed, at least they will have to keep rubbing the wooden pole with their hands for half an hour. ”

Chen Yajun glanced up at Bao Feiyang, and quickly avoided the look he saw and turned his pretty face to the side, his body trembled uncontrollably, and his lips trembled and said, "Rubbing for half an hour, you may not be able to make a fire." Even if I could make a fire, maybe I would have frozen to death by then. ”

Bao Feiyang looked at Chen Yajun clinging to his body after getting wet, and the snow-white skin exposed on his back waist had been frozen purple, so he nodded and said seriously: "Well, you really can't wait that long for you to look like this." ”

Chen Yajun saw Bao Feiyang's gaze fall on him again, and he didn't leave, he forgot about the cold for a while, his face was ashamed and annoyed, and he shouted at Bao Feiyang: "You don't just look at it, then do you have any way to make a fire!"

Bao Feiyang nodded confidently: "Of course, you sit still, I will be able to make a fire for you soon." ”

Bao Feiyang also knows that it is very important to make a fire, the rain outside is getting heavier and heavier, and he doesn't know when it will stop, and now the mobile phones of the two of them are broken, and there is no way to get in touch with the outside, and I don't know how long it will take for someone to find out that they have lost contact, and then find them. Maybe you can save yourself and have the opportunity to go out on your own.

There were also some dead branches and vines in the cave, as well as scattered leaves that had been swept in by the wind outside, and Bao Feiyang quickly gathered some dry branches and leaves, and then piled them up near the entrance of the cave.

Chen Yajun watched Bao Feiyang busy from afar. Gradually, she got rid of the shame and frustration, and forgot about the cold for a while, which felt quite interesting, at least in her twenty-five years of life experience, she had not experienced this kind of scene before.

"Hey, you don't have a lighter. You don't have to drill wood to make fire, how do you plan to make this pile of branches burn, do you have to rely on hitting stones to make fire? That seems to be more difficult!" Chen Yajun pursed his lips and said with some disbelief.

"Of course I wouldn't do it in such a primitive way. Bao Feiyang shook his head, only to see him take out something from his pocket, and then shook it at Chen Yajun.

Chen Yajun thought it was a lighter at first. If you look closely, you know that it is not, it is a small tin box with chewing gum, and it can probably put ten green arrow chewing gums in it. Could it be that Bao Feiyang has hidden something good in it?

"Do you want one?" Bao Feiyang walked over with a box of chewing gum, the box was very well sealed, and there was no water inside, Bao Feiyang took out a piece of green arrow gum and handed it to Chen Yajun.

Chen Yajun stretched his neck and looked into the box, and found that there was nothing else in it except for a few green arrows left. She couldn't help but ask strangely, "There's nothing to make fire in it, do you want to use chewing gum to make fire?"

Bao Feiyang saw Chen Yajun's eyes widen and look at her suspiciously, and she didn't take the chewing gum handed to her. So he took back the wrapping paper that peeled off the gum three times or twice, and then handed the peeled gum to Chen Yajun again: "Chew it, this can make you relax, and the sugar in it can also allow you to temporarily replenish your calories." ”

Chen Yajun subconsciously opened her mouth and bit it, and then her cheeks turned red with shame, as if Bao Feiyang was feeding her. It seems that only couples and children will be like this, it is too intimate and ambiguous.

Bao Feiyang didn't seem to pay attention to the change in the other party's demeanor at all. didn't look at Chen Yajun, but continued to get busy by herself. I saw that he put away the small tin box containing the chewing gum again, and then carefully unfolded the tin foil that packed the chewing gum, and then tore out a long strip along the diagonal.

Then, Bao Feiyang folded the tin foil strip in half at both ends, and then tore off a little bit at the fold place, but the middle was still connected, forming a narrow middle and two slightly wide strips.

"What are you doing with this?" Chen Yajun asked curiously while unconsciously chewing the gum in his mouth, and was attracted by his series of actions for a while, but he temporarily forgot the pain in his feet and the cold on his body, and his flickering beautiful eyes were full of questions.

Bao Feiyang seemed very focused and careful, but still didn't glance at Chen Yajun next to him, but replied briefly: "Make a fire-"

"How do you make a fire? Now there's no sun, and you don't have a magnifying glass. Chen Yajun really doesn't understand how a piece of tin foil can make a fire, she studied physics when she was a child, and knows the principle of gathering and making fire with a convex lens, but there is a weather limit to the success of this kind of thing, unless it is a sunny day, use a magnifying glass to focus the sunlight on one point, and put the tin foil under the gathering point for about two minutes, it should be able to ignite the tin foil, but now the wind and rain, even if there is a magnifying glass, it is useless, not to mention that the contents of the small iron box in Bao Feiyang's hand are clear at a glance, except for chewing gum, there is nothing, can he still play any trick to conjure up something out of thin air？

"You'll find out later. Bao Feiyang continued to work without raising his head, he put the tin foil aside, pressed it with a dry branch, and then picked up the phone and battery that he had taken out before.

Bao Feiyang's mobile phone also got into the water, he just tried to turn on the original parking place, but he couldn't turn it on, and there was no suitable tool in his hand, he couldn't disassemble and dry, and there was nothing to separate from the water, which was equivalent to being soaked in water all the time, and now the circuit inside must be all broken and can't be used.

He threw the phone back in, holding only the battery, then turned the tin foil strip inward on one side of the phone's battery, and the other end on the negative end of the battery, and stretched the battery and tin foil under the pile of branches that had been erected long ago.

Chen Yajun blinked: "The battery, short circuit, can it make a fire?"

Chen Yajun's mind was full of question marks, Bao Feiyang's method was really incredible, she had never seen anyone use this method to make a fire before, and she had never even heard of it. A small mobile phone battery only has a lot of voltage, how much current can it generate, even if it is directly connected with two real wires, I am afraid it will not burn up, and it will be difficult to spark. What can tin foil be used for?

Just when Chen Yajun was puzzled, her eyes suddenly flashed, she thought it was an illusion, her eyes widened and she took a closer look, and sure enough, from the gap between the branches, she saw a trace of open flame faintly jumping there happily, although only a small spark flashed. But it was a spark that was ignited. At first, she thought that Bao Feiyang was teasing herself, but when she saw the ignited sparks, she couldn't help but be surprised.

"Fire, fire, really fire!" Chen Yajun was surprised and delighted, she didn't expect Bao Feiyang to really be able to use this method to make a fire successfully; with fire, she could dry her clothes. She can keep warm, she doesn't have to be afraid of the animals in the mountains, and she can even get something cooked to eat, even if the search and rescue people can't find them right away, even if the two of them stay here for a while, she won't feel panic like before.

The flame first started from the tin foil strips, then quickly ignited other foils and wrappers, and the larger flames ignited the dried leaves of the canopy that covered them. Bao Feiyang hurriedly lay on the ground, puffed out his mouth and carefully blew into the flames, and finally the shaky flames formed a large spark. Bao Feiyang hurriedly and carefully added some of the dry branches he had just collected, and took care to keep the gap in the middle, so that there was enough air in the branches.

Seeing that the pyre was finally lit, Bao Feiyang, who had been busy for a long time, also let out a long breath, don't look at him It seems that he is very capable of lighting a fire in this very rare way, in fact, it is the first time he has used this method to light a fire. Today, I just try step by step according to the memories of relevant physics knowledge when I was a child. This is also thanks to a test about electricity that his teacher taught him in middle school.

"Hey, you're amazing. But how did the tin foil burn, even if it was a short circuit, it wouldn't be so easy to burn, right?" Chen Yajun rested for a while, and felt really better, seeing the fire coming up, she couldn't wait to stand up, jumped twice with one foot, and wanted to go to the fire to take a closer look, is there a mystery in it that she didn't notice just now.

Unexpectedly, the ground in the cave was not flat, and it was even more difficult for her to maintain balance while jumping on one foot, and she was suddenly crooked, and she was about to fall to the ground.

Bao Feiyang hugged Chen Yajun tightly with both hands, adjusted his body to the position below the moment before falling to the ground, turned himself into a meat pad, and did not let the girl in his arms be hurt at all.

"You, you don't matter, right?" Seeing the face that was close at hand, grinning and distorted by pain, Chen Yajun hurriedly asked anxiously.

Bao Feiyang grinned, barely squeezing out an ugly smile: "It's okay, I'm strong." ”

Chen Yajun was lying on Bao Feiyang at the moment, and an idea suddenly popped up in his mind: his chest is indeed quite strong, generous, powerful and elastic, well, it seems that it feels quite comfortable to lie on it, more comfortable than the mattress at home. Immediately, she was ashamed that she had such an idea, and soon realized that she was now lying on Bao Feiyang's body, and the two people's bodies did not have a trace of gaps, almost close together.

Chen Yajun hurriedly struggled to prop up her hands on the ground on both sides of her body, wanting to stand up by herself, but she didn't expect Bao Feiyang to use her hand violently and hug her tighter: "Don't move, pull your feet again, I will carry you down the mountain." ”

Chen Yajun couldn't help but pouted her lips dissatisfied, her apricot eyes rolled up, thinking that it would be cheaper for you to carry it, and I wouldn't let others carry it! But the more she tried to get rid of it, the more the thought seemed to jump out of it, and it stubbornly hovered in her mind and didn't want to leave.

Bao Feiyang helped Chen Yajun, first let her slowly turn sideways, and then sat down next to her, and then he got up, picked up Chen Yajun directly, and put her next to the fire.

When Chen Yajun was picked up by Bao Feiyang, her mind suddenly went blank, and when she just reacted, Bao Feiyang had already put her down on a relatively dry and flat open space next to the fire: "You bake the fire first, and I'll see if I can get something to eat." ”

Chen Yajun lowered her head, although she didn't dare to look at Bao Feiyang, the huge question mark in her head hadn't been removed: "You haven't said why this fire is burning!"

Bao Feiyang shrugged his shoulders, smiled faintly and said, "What's so difficult about this, this uses the knowledge of junior high school physics." ”

"This side of the tin foil is conductive, I tear it into a long strip, it is equivalent to making a wire, the conductivity of tin is good, the resistance is relatively small, the tin foil chain is connected to the positive and negative poles of the battery, it will form a current loop, that is, a short circuit. ”

These knowledge was learned a long time ago when he was in school, but Bao Feiyang now recalls it and feels very clear in his mind, maybe it was better physics at that time, so he was deeply impressed, and he will not forget it to this day.

"Short circuit?But the voltage of the mobile phone battery is very small, and the current is also small, why did it catch fire?" Chen Yajun still didn't understand, at least when she connected the copper wire to the two ends of the battery, it didn't cause a fire, and even the wire didn't become very hot immediately.

Bao Feiyang said: "Because the tin and the paper are together, it is easy to ignite the paper if the tin is hot, and I cut the middle of the tin foil narrow, which is equivalent to making the cross-section of the wire smaller, so that the resistance of this section becomes larger, which is equivalent to connecting a heating wire, and this section will heat up, so the tin foil will ignite." ”

"It's that simple?" Chen Yajun tilted her neck and thought about it, she was also an excellent student when she was a child, and her academic performance was also good, at this time, she filtered the physics knowledge she had learned in her mind, and verified it with theory, it seems that this is really the case, Bao Feiyang used tin foil to simulate wires and heating wires, although it looks too simple, but the principle is the same.

Chen Yajun stared at Bao Feiyang and looked at it, as if she had found some monster: "I heard that your mainland's exam-oriented education is very powerful, and the exams for international students from the mainland are very good, but your hands-on ability is not good, I don't think you look like this!"

Bao Feiyang smiled and said: "Of course, in fact, if you learn scientific theories well, your hands-on ability will also become stronger, and the key is to have imagination." ”

Looking at the smiling Bao Feiyang, Chen Yajun suddenly became less worried. She knew that since Bao Feiyang had a way to light a fire to dispel the cold, there must be a way for them to survive this storm on the cave, even if his father didn't find out that something had happened in time and sent someone to look for him, Bao Feiyang had a way to take himself down the mountain safely!

This is really a reassuring man! (To be continued)