A classic scene in a martial arts drama: a certain martial arts master meditates cross-legged, his eyes closed, and a trace of white smoke comes out of his head.

This way of expression concretizes the abstract internal skills of the mysteries, allowing the audience to intuitively and clearly see that the characters are practicing, and the exercises they practice are very awesome, highlighting their profound and majestic internal skills.

Now, Xu Wentang wants to reproduce this classic scene.

The big question is, how do you get smoke overhead, and where does that smoke come from?

"Smoke can be divided into two categories: dust, mist, or a mixture of the two. ”

"Dust is very tiny particles, such as smoke from burning tobacco, and fog is vaporization of liquids, such as water vapor, dry ice. ”

Xu Wentang thought about everything he could think of, and felt that the best prop should be dry ice.

Dry ice is solid carbon dioxide.

The applications of carbon dioxide can be said to be very widespread.

For example, dry ice fire extinguishers.

Carbon dioxide has a higher density, about 1.5 times that of air. At atmospheric pressure, liquid carbon dioxide will vaporize immediately, and generally 1kg of liquid carbon dioxide can produce about 0.5 cubic meters of gas.

Dry ice, when it turns from solid to gas, will absorb a lot of heat, so that the temperature of the surrounding air will drop quickly, and the air temperature will drop, causing the water vapor to liquefy and release heat, which will become small droplets, which is the fog we see with the naked eye.

"With the source of the smoke, there is also a need for guidance devices. ”

Smoke is diffuse and uncontrolled, as long as it is released, it spreads to the surroundings, and if it is not guided, it will inevitably smoke everywhere, and there will be no picture of smoke only emitting from the top of the head.

"Gotta buy some tiny hoses. ”

Xu Wentang thought about all kinds of details, and felt that as long as he got dry ice and a small hose, it should not be a problem to shoot the effect of "smoke overhead".

Just do it when you think of it.

However, I couldn't do it before I started.

The reason is, there is no money.

It costs money to buy dry ice, and it costs money to buy tiny hoses.

Xu Wentang is still a junior in high school, has no source of income, the little money in his wallet is mainly meal tickets, and the pocket money at his disposal is pitiful, only enough to buy some small hoses.

Of course, don't you have parents, ask them if they want it!

It doesn't work either.

The Xu family's house was bought with a loan, and the mortgage is still being repaid, Xu Wentang and Xu Wenjuan also spend a lot of money to go to school, and the family's daily expenses are all supported by their parents' salaries, barely maintaining a balance.

If one day the grandparents and grandparents fall ill one or two, the Xu family will inevitably have a financial burden.

Alas, a penny is hard to kill a hero!

Thinking of this, Xu Wentang's thinking gradually diverged, and he didn't find a solution, but suddenly thought of a major omission!

Here's his plan – shoot a realistic fake video and upload it to the class group (the only social circle) and then earn popularity from his classmates.

However, his classmates did not know the practice of "Nourishing the Heart Sutra".

"When you click on my video and see me meditating on my knees with smoke coming out of my head, what's your first thought?

It must be...... What kind of skill is Xu Wentang practicing? Why is it smoking, it can't be a madman, right?

Instead of...... Wow, Xu Wentang has practiced the "Heart Sutra", which is awesome! ”

Thinking of this, Xu Wentang found that this matter was far more complicated than he imagined, and it was not easy to operate.

"Don't be in a hurry, solve problems and solve them, one by one. ”

Xu Wentang sorted out his thoughts and listed the problems that needed to be solved in order.

The first step is to solve the problem that students do not know the "Heart Sutra";

The second step is that even if the students know the "Heart Cultivation Sutra", how can they make them think that I am practicing the "Heart Cultivation Sutra" as soon as they see the fake video;

The third step is to solve the problem of shortage of funds.

"Alas, counterfeiting is also technical work. Xu Wentang sank down, thought about it back and forth, and the ideas came to mind one by one, and then eliminated one by one, and the corners of his mouth gradually curled.

After a while, Xu Wentang had a plan and thought of a solution to the first two problems.

Pick up your phone and turn on the camera.

Xu Wentang gathered his palm, cast the black sand hand, and then the camera focused on the black hand and took a photo.

Then open the "Heart Sutra", turn to the first one, and take a picture of one of the pages, and the focus is just the text description of "smoke rising above the head".

The two photos together.

Mark a line of text: Encourage you together, the mysterious exercises help me practice the strongest iron sand palm in seven days!

Xu Wentang glanced at the picture and text, and after thinking that there was no problem, he uploaded it to the class group.

At this time, the class group is quite quiet, and no one is irrigating.

I waited for almost a minute.

Sun Dapeng: What the hell, this black hand is an iron sand palm?

Zhu Dawei: I don't understand, the iron sand palm was originally called the black sand hand, and this is what it looks like to practice to great achievements.

Bancao is here: Xu Wentang has practiced the iron sand palm to a big time!!(Shocked)

One day of love: What kind of exercises are so awesome?

Huo Qianqian: Same question.

Zhou Mingshan: Same question.

......

Xu Wentang waited silently, the atmosphere was almost hot, and he announced the name of the exercise: "Yang Xin Sutra", a relative and friend passed on the exercise, and my father specially asked for me.

Next, the group hotly discussed the "Heart Sutra", and gradually, some students publicly @ or privately messaged Xu Wentang, hoping that he could share this exercise.

Of course, Xu Wentang can't share it, as soon as the exercises are leaked out, maybe the horse's feet will be exposed, no, it should definitely be exposed, because the Heart Cultivation Sutra is not an auxiliary exercise of the iron sand palm at all.

"With this foreshadowing, I can confidently and boldly make fake video uploads. ”

The question is back to the money.

"Cousin, do you have any other magazines here?" Wang Hu shouted at him.

At this moment, the dead fat man was reclining on a chair on the balcony, cross-legged Erlang, looking at the swimsuit photos of those models in the magazine, and his saliva was dripping.

Xu Wentang was speechless, his eyes flashed, and he asked, "Fat Tiger, how much money do you have?"

"Almost...... 13 pieces, what?"

"You go to the commissary downstairs and buy a pack of cigarettes, whichever is the cheapest. Xu Wentang said.

"Cousin, when did you start smoking?" Wang Hu sat up in surprise.

"Less nonsense, go buy it. Xu Wentang made up his mind, as long as he dared to say half a word, he would immediately drive this guy out of the house.

Wang Hu hesitated for a while and went.

Rub downstairs, rub upstairs.

"Cigarettes are bought, eight yuan a pack of Tashan, the cheapest. Wang Hu handed over the cigarette, held it for a long time, and said, "Cousin, smoking is harmful to health, you take it easy." ”

"I know smoking is bad for your health, so this is bought for you to smoke. Xu Wentang smiled.

"What?" Wang Hu blinked, a little confused.

"You wait here for me for a moment. Xu Wenhu turned around and went to the house next door, very lucky, and borrowed a few thin hoses, all of which were more than two meters long.

"The materials were well prepared. ”

Xu Wentang was very excited, and wrapped five thin hoses together with duct tape, the front end spread out, and the other end was tightly wrapped.

Then, he handed the lighter to Wang Hu and said, "Light a cigarette, smoke it, and spit the smoke into these hoses." ”

“...... Why?" Wang Hu was very confused, looking inexplicable.

"You'll know right away, do as I say. Xu Wentang fixed the camera as he spoke, sat down cross-legged by himself, and inserted the front end of the hose into his hair from his head, blocking the rest behind his back.

"Fat Tiger, blow out the smoke. Xu Wentang put his hands on his knees, pinched the trick, closed his eyes, and looked solemn.

Seeing this, Wang Hu was completely confused, but he was also very curious about what his cousin was doing, so he did so.

"Ahem, ahem, ahem......"

Wang Hu smoked his first cigarette, almost coughed up tears, and blew hard into the hose, and the smoke rushed down the hose to the other end.

After a while, the rising smoke escaped from Xu Wentang's hair!