The hustle and bustle in the outside world is thousands of miles away, and it is naturally impossible for Bi Fang, who is at the top of the world, to know about it.
In a confined and narrow space, he was holding on to the snow wall to measure the size of the space, and at the same time taught the audience some issues on how to save oneself after encountering an avalanche.
"The release process of an avalanche usually goes through three stages: First, under certain snow conditions, external factors cause some of the snow layers to shear, break, and become dislocated, causing small scars to appear on the fragile snow."
"Then, this small scar will 'infect' the surrounding snow layer, and the scar will gradually expand, causing the surrounding snow layer to become dislocated."
"In the end, the snow on the hillside continued to collapse like dominoes, forming a scar on the calm hillside. The scar eventually fell off and an avalanche poured down. This kind of avalanche can be avoided by observing in advance."
"Of course, there are also types without warning, such as slab avalanches, which are characterized by linear cracks in the snow in the area where the avalanche originated. It looks like a whole slab of snow has collapsed. Sometimes the cracks expand with several
Hundreds of meters long. Even if the thickness of the snowboard is very thin, the total volume of these moving snows can still be staggering."
【What kind of avalanche did Lao Fang encounter? 】
"Although I can't see the barrage now, I know you will definitely ask me what kind of avalanche I encountered this time, but in fact, I don't know. It was too dark at four o'clock in the morning and I couldn't see carefully. If the satellite captured it
If so, you should be able to see it,"
Bi Fang shook his head. He always felt that this avalanche might not be a coincidence. Otherwise, why would he be so unlucky this time?
"If an avalanche is already in front of you, take a deep breath, hold your breath, and if there are trees, rocks or solid objects around, hold on tight, because the impact airflow of the avalanche is very strong, try not to be swept away by the snowflow."
"If an avalanche happens to happen under your feet, try to jump up and run up across the fault line. However, avalanches usually happen very fast and there is no time to react. If you are unfortunately caught in the snow flow, you must go upstream.
The swimming posture is to move the limbs upward to maximize the surface of the snow flow. The shallower the body is buried, the greater the chance of survival."
"When you are buried in the snow of an avalanche and cannot break free, you must reduce your activities and slow down your breathing to save energy. Certain emergency breathing devices can help the person in distress hold on for dozens of minutes."
"Of course, you can also try to save yourself by shaking your body to widen the surrounding space bit by bit, freeing your hands to swim up like a swimmer, but I don't recommend this without certain skills and judgment, because widening the space will
The process is very physically demanding, which means that oxygen consumption will increase and the risk of suffocation will increase. Normal people cannot judge how deep they are buried. The deeper they are, the greater the risk."
[By the way, although the space is now larger, is it okay if Fang Shen keeps talking? Will it increase the consumption of oxygen? 】
[Yes, although everyone else is using oxygen bottles, this little space can’t sustain it for long, right?]
"After the avalanche, we are extremely lucky. If you encounter this kind of situation, there is no need to go out. You can stay here for a whole day. As for the oxygen problem, there is no need to worry at all. As long as
How long can one breathe with one cubic meter of air?”
Bi Fang stretched out a palm, and under the illumination of the headlight, the audience could clearly see five fingers.
Although Bi Fang had to pretend that he couldn't see the barrage, he could answer the questions in a more contextual way to ensure audience interactivity.
Five fingers, this is five minutes?
The audience thought for a while and roughly guessed a time, one cubic meter for five minutes, which is about this number.
"It's five hours."
puff!
Five hours?
Are you kidding me?
【Five hours, are you crazy?】
[Is this you practicing the Turtle Breathing Technique?]
[I have read a novel written by a street-fighting author named Crustacean Ant. I heard that the turtle breath technique is because turtles can exchange gases in water through the organs near the g-door. I don’t know if it is true or not]
[If the person who said this was not Fang Shen, it would be absolutely impossible for me to do so]
In any case, it is unbelievable that one cubic meter of air can allow a person to breathe for five hours.
"I know some of you are definitely not good at it. In fact, you will know just a simple addition and subtraction. I will give you some questions." Bi Fang smiled, then pondered for a while, and spoke after a while.
"It is known that in normal air with an atmospheric pressure, an ordinary adult male inhales approximately 0.5 cubic meters of air per hour while lying still, and the oxygen concentration is 21%. He breathes 0.5 cubic meters of air per hour.
At the same time, 5% of oxygen is consumed, and the exhaled gas contains about 16% of oxygen and 4% of carbon dioxide. But when the oxygen concentration drops to 6% and the carbon dioxide concentration reaches 8%, the person's heart will stop beating within a few minutes.
A man is currently trapped with only one cubic meter of air. How long can this man hold on until he is rescued?"
That’s outrageous!
[I’ve graduated from fucking college, can’t I get rid of math problems? 】
【Algebraist!】
[It turns out that mathematics can be used not only for shopping for groceries, but also really useful, woo woo woo.]
【Forget it, forget it】
【Forget it】
"Air has two functions for human breathing. One is to provide sufficient oxygen for inhalation. Inhalation is about half a cubic meter per hour. On the other hand, air is also responsible for the diffusion of carbon dioxide exhaled by people. To complete this task, it takes about
30 cubic meters per hour, this is the standard for healthy living."
"Someone once died suddenly while wearing a mask while running. The fundamental reason was that the carbon dioxide in the exhaled air did not have time to diffuse and was breathed back."
"I don't know if anyone has calculated the result now, but I can tell you right now that the answer is about 5.2 hours. Of course, this is a rough estimate and the actual situation is different. Because after breathing for a short period of time, the oxygen content in the air
If it is too low, people will increase their breathing depth and even yawn. In addition, they are nervous and have a fast breathing rate in a small closed space. 5.2 hours is the ideal state. Basically, ordinary people will belch easily after three hours."
Bi Fang raised his head and looked around, fully displaying the confined space.
"There are at least ten cubic meters here. There is no need to worry about the oxygen problem. It's okay to talk. But we still have to get out as soon as possible because the stability here is doubtful and it is likely to collapse. We can't stay here forever.
"Random digging of holes may affect the stable structure of the entire space, so we exit from the hole we originally dug."
Bi Fang looked at the entrance of the cave where he and Tenzin entered, and began to take out the snow in the cave. At the same time, he kicked Yao Jun, who was lying on the ground.
"What are you doing standing still? You've got up to work. Do you still want to eat?"
Yao Jun was stunned for a moment: "Eating? Batter again? I almost vomited."
"It's a pity that I didn't bring many energy bars, so you can't even eat batter here, you can only eat energy gels."
"yue!"
When he thought of the energy gel that tasted like snot, Yao Jun almost retched and could only reluctantly get up from the ground.
"Damn, I'm really working hard."
It is known that the volume fraction of CO2 contained in the air that causes death or shock is 10%.
For the convenience of calculation, the volume fraction is used here, which is different from the concentration in the article. These are two different things.
Therefore, when CO2 in the air reaches 10%X1000L=100L, death or shock will occur.
The volume fraction of CO2 in the air is 0.03%.
The original CO2 in the air is about 0.03%X1000L= 0.3L.
So as long as CO2 is exhaled 100L-0.3L=99.7L, it will cause death.
The volume of gas exhaled by a person each time is about 0.5L.
Breath approximately 16 times per minute.
The volume of exhaled gas per minute is approximately 16X0.5L=8L.
The volume fraction of CO2 in exhaled gas is about 4%, and the CO2 contained in exhaled gas per minute is about 4%X8L=0.32L.
There is no need to worry about oxygen. The volume fraction of oxygen in the exhaled gas is 16%. It cannot be completely inhaled. 16% of the volume of oxygen is still discharged into the air with each breath. Usually only the carbon dioxide concentration is calculated.
Therefore, when a person breathes for about 99.7÷0.32=311.5625min≈5.19h, he will die.