Seeing this horrific scene, what do you think?
This guy is definitely cheating!
Flowing down this trough is molten molten iron at temperatures as high as 1370°C.
Slapping the molten iron like this, the molten iron is fine, the palm is also fine, it is completely incredible, how can it be done without cheating?
In fact this guy did "cheat" because he "coated" a substance called dihydrogen monoxide on the palm of his hand.
The guy was named Arkadi Magdijan, an Armenian steelworker.
When you first entered the factory, the senior workers said that we have a "coming-of-age ceremony" here, and only by passing this test can you be considered a qualified steel worker in the factory.
Magdijan asked what the ceremony was, and the co-workers took him to the iron trough and began to perform the "Great Divine Skill" of slapping the molten iron.
Magdijan was frightened, hesitated for half a day and did not dare to try, such a high temperature, did not burn the palm into a "red burnt" bear paw?
Netizens saw this video and also questioned:
This guy must have some kind of insulation on his hands.
The molten iron must have been fake, and the temperature was not much higher.
One metallurgist said, I can tell you responsibly that I never thought to try this.
It's a bit like sweeping your finger over a candle, I've tried it many times on candle flames, but I'm never going to try this!
Well, I remember when my hands were covered with batter, and I put it in the frying pan and fried it for 30 seconds, and the outside was scorched and tender.
I worked in a foundry, and the olders liked to go shirtless, and the splash of molten iron would pop out of their chests or they would stick to their clothes, burn through them, and stick to the skin to continue to burn.
Well, I work at an aluminum foundry, and the first time I went, a colleague bet with me that he could put his hand in the molten alloy and drink coffee if he lost. I think this guy was talking about playing, and as a result I invited him to a drink.
Delhi, India, has a fried fish for sale that can catch fish from a hot oil pan with your bare hands without any burns, what explanation do you have?
Well, I'm going to go back and pat my faucet and clap the water out of the water even more.
It looks very lively, can this molten iron be seen with the palm of your hand, will it hurt?
If you're a housewife, you've had the experience of accidentally dripping a few drops of water into a boiling pot, and the water droplets don't vaporize right away, but roll around in the pot.
This was the Leiden Frost phenomenon, which was first noticed in 1732 by the famous Dutch botanist and physician Herman Boerhaave, but he failed to give a convincing explanation.
It was not until 24 years later, in 1756, that the German physician Johann Gottlob Leidenfrost, after in-depth research, made a scientific explanation in his article On the Nature of Ordinary Water:
If the liquid comes into contact with an object far beyond its boiling point, the surface of the liquid will produce a layer of vapor with insulating effect, which greatly slows down the boiling speed of the liquid, which is therefore called Leiden Frost phenomenon, and the liquid reaches the temperature point generated by the Leiden Frost phenomenon, which is called the Leiden Frost characteristic, and the Leiden Frost characteristic of water is about 193 ° C.
So you can experiment with your iron pot, if the temperature at the bottom of the pot is just over 100 ° C, you drop a few drops of water into it, the water will only make a hissing sound and quickly boil and vaporize.
But when the bottom temperature of the pot comes to 193 ° C near the Leiden Fros characteristic, you drop a few more drops of water into it, and the water droplets will roll around at the bottom of the pot, slowly evaporating, which can last longer than at 100 ° C.
This is because when the Leiden Frost phenomenon is generated, the water droplets and the bottom of the pot contact will quickly boil to form water vapor, and the water droplets still maintain the state of liquid, due to the large spacing of water vapor molecules, much slower than liquid water heat transfer, the vapor layer plays a role in heat insulation, liquid water can not be directly in contact with the high temperature of the bottom of the pot, thereby greatly reducing the speed of evaporation of water droplets.
Of course, the characteristics of water in Leidenfros will change with the impurities in the water, the material of the bottom of the pot, the temperature of the water droplets, etc., but it is roughly maintained around 193 ° C.
So you want to stir-fry vegetables on high heat, see if the temperature at the bottom of the pot is high enough, you can use a shovel to drop a few drops of water, see the water droplets rolling around in the pot, you can start the operation.
When you watch a movie or go to some tourist area to see a show, you may also see some kind of soup and fire show, people walk barefoot through the fire, which is to take advantage of the Leiden Frost phenomenon, soak your feet in the water, you can walk on the fire - of course, you have to pass quickly, otherwise it will become a roasted bear paw.
Therefore, the new Armenian steel worker Magdiyan at the beginning of this article, after understanding the principle, also "coated" his hands with water (dihydrogen monoxide), carefully tried it, successfully passed the "coming-of-age ceremony" of the factory, and began to tell the legend of the Leiden Frost phenomenon to the younger generations.
Leiden Frost phenomenon lasts a short time, so you can't keep stepping on a fire or grabbing the molten molten iron with your hands, because as the surface temperature of the solid continues to increase, the effect of thermal radiation becomes more pronounced than heat conduction, at which point the water will quickly evaporate.
In fact, not only will the water form the Leiden Frost phenomenon, but the liquid nitrogen will also boil rapidly on the hand to form an insulating layer to prevent the hand from being frostbitten, so it can be directly touched with the hand; some people wet their hands and put it into the melted lead. (Warning: Theoretically, please do not act accordingly, the consequences are at your own risk)
Leiden Frost phenomenon in modern science and technology also has many applications, the most typical is the liquid rocket engine used in space launches, can make ultra-low temperature liquid fuel or oxidant in the engine combustion chamber and the inner wall of the nozzle ooze out to form a layer of air film, block the heat transfer of high temperature gas and chamber wall, this technology is called "air film cooling", can make the liquid rocket engine in the extremely high temperature gas continuous work for 1.5 minutes to 5 minutes, but also can be ignited and reused many times.
Stay tuned: