1. What is the temperature of liquid nitrogen below zero? About -196 degrees Celsius to -210 degrees Celsius.

2. The temperature of liquid nitrogen is between about minus 196 degrees Celsius to about minus 210 degrees Celsius. Liquid nitrogen is converted from nitrogen, at standard atmospheric pressure, when the temperature is reduced to about minus 196 degrees Celsius, the nitrogen will become liquid, and if the temperature continues to fall to about minus 210 degrees Celsius, the liquid nitrogen will turn into snow-like solid nitrogen. Liquid nitrogen is colorless, odorless, non-flammable and inert, and is generally used as a refrigerant in life.

3. What are the hazards of liquid nitrogen at -196 degrees?

A friend who does snacks at the night market told me, don't look at him every night only out of the stall 6 hours, but can earn 500,000 a year, and he gave up because of the terrible minus 196 ℃ liquid nitrogen!

With the development of network technology and high-speed transmission of information, the market appeared, a variety of food we have never seen before.

The food is also very close to the needs of various people, whether it is expensive land cattle and sheep under the sea fresh, or grounded in the skewers gluten stinky tofu, always let us find their own favorite food.

I believe that no matter who in the face of a variety of food, always can not help but want to go to taste a couple of mouths, and for the temptation of food, many people simply can not resist.

And as the most famous sage in ancient times, Mencius and Suzi debate also said a sentence that has been handed down to this day, this sentence in the "Mencius. The words remain in the book "The First Book of Mencius":

When Mencius debated with Suizi, Suizi said: "Food and color are the same as sex. Benevolence is internal, not external, and righteousness, not external. Many people put this quote and Confucius' Eat, Drink, Man, Woman? put together!

In fact, this behavior is wrong! The meaning of this sentence of the sue is that food is a verb here, with the meaning of favorite, and the color here is the meaning of a good attitude.

That is to say, Su Zi is a person who is full of love for food, that is, what we often call a gourmet, of course, the ancient gourmet is certainly not as happy as the present-day peasants.

Compared to the cold of winter, which leads to a lower desire for food, the hot summer days are the best time for gourmets to go out and find their prey.

One of the favorite foods of the summer is ice cream, which comes in many different varieties and flavors that we can't imagine.

However, without realizing it, a special kind of ice cream has emerged on the streets, which is liquid nitrogen ice cream, which is said to be made with liquid nitrogen at -196℃.

Some people say that this kind of liquid nitrogen at -196℃ is very scary, but what about the liquid nitrogen ice cream circulating in the market! More coincidentally my friend used to make this liquid nitrogen ice cream in 2018.

I asked my friend with this question, and my friend told me: do not look at him only out of the stall for 6 hours every night, but can earn 500000 yuan a year, relying on the terrible minus 196 ℃ liquid nitrogen!

Friends do liquid nitrogen ice cream in the finished product, will be in the whole operating table shows white smoke, in the hot summer under, more than a cold cool, but also a sense of fairy air.

So attracted a lot of passing fairies scramble to buy, many girls after eating this liquid nitrogen ice cream, not only feel particularly delicious will also exhale a mouthful of white air from the mouth, looks particularly lovely.

However, now my friend is determined to quit, and the reason is because of the terrible thing of liquid nitrogen at -196 ℃, for which he specially explained to me the specific reasons!

So why is liquid nitrogen as minus 196 ℃ terrible? And why can it exist as a delicacy? What's the secret behind it? Let's talk about the answer to this question now!

What is liquid nitrogen at -196C?

In fact, liquid nitrogen, which looks very amazing to us, is instead just one of the most commonly used cryogenic liquids in laboratories, and the cryogenic temperatures I'm talking about here don't mean very low temperatures.

And liquid nitrogen is a special material, it is special not in the surface temperature, but in its own temperature under the temperature, which is an extremely cold material.

In addition, liquid nitrogen is a very inactive liquid, compared to other liquids, liquid nitrogen has colorless, odorless, non-corrosive, non-combustible, extremely low temperature characteristics.

It is formed under high pressure, liquefied by specialized equipment, and then stored in a special insulated box by specialized personnel.

When we use it, we only need to open the insulation box in a normal environment, as the liquid nitrogen will be rapidly exchanged with the heat in the air, forming a white mist visible to the naked eye.

This liquid is very much like the white clouds we see in the sky, and if this liquid nitrogen is placed in a stage, it gives a feeling of being in a fairyland.

The scene of Chang'e's dance in the Lingxiao Palace in the most famous domestic TV series Journey to the West uses liquid nitrogen to make the actors look as if they are dancing in the heavenly palace.

Is there any harm in liquid nitrogen at -196C?

I have explained in detail above, liquid nitrogen is an extremely cold liquid material, since it is a material, there must be a way to use him, then in the process of using it, it will cause what harm to our body?

In fact, you want to figure out the hazards of -196 ℃ liquid nitrogen only need to go through the following two points to say:

The first point, liquid nitrogen ultra-low temperature!

Liquid nitrogen as a material that does not rely on the external temperature to change the temperature, its own temperature is maintained at -196 ℃ between, as a very cold material.

We can normally touch it with our hands, but not for more than two seconds, and contact personnel need to wear insulated leather gloves, goggles, masks, and long-sleeved shirts.

If the touching personnel in the case of protection is not in place, prolonged contact with -196 ℃ liquid nitrogen, will let the skin quickly freeze and cause great damage.

Even if the protection is in place for the exposed skin after a short contact, liquid nitrogen can cause cold, burns, frostbite and permanent damage due to the temperature of the liquid nitrogen.

In addition, when our hands accidentally touch the liquid nitrogen, part of the liquid nitrogen will quickly vaporize, forming a special air cushion on our skin to protect the layer,

If there is not yet vaporized liquid nitrogen, drop to our skin, it will be directly slid away from the skin will not stay, and our skin will not be harmed!

The second point: asphyxiation!

Since liquid nitrogen is a colorless and odorless gas, when we keep it in our room, inadvertently the container where it is stored will instantly expand up to 695 times if there is a leak!

If the room is sealed, the extremely rapid expansion of liquid nitrogen will reduce the percentage of oxygen in the air to less than 19.5%, which will cause the operator to lose consciousness.

We humans, in turn, rely on oxygen to survive, and when oxygen is lost for a period of time, this can lead to an asphyxiation hazard, which can eventually kill the operator!

And what about the Netflix treat, liquid nitrogen ice cream?

We've talked about the dangers of liquid nitrogen above, and explained that the liquid nitrogen used by our friend is a product that has been specially processed by the company.

And even if the processed product, liquid nitrogen is also very dangerous, so how was the friend's liquid nitrogen ice cream made?

1: The practice of liquid nitrogen ice cream!

In fact, this practice is very simple, just follow the normal practice of ice cream, and then trade breaks in it, but or put the ice cream in a liquid nitrogen pot to soak for some time.

Then take it out to customers can be, and which plays the most critical role is the liquid nitrogen at -196 ℃, liquid nitrogen at room temperature you and the heat in the air for rapid exchange, the formation of a white mist.

2: What is the flavor of food processed with liquid nitrogen at -196°C?

Because liquid nitrogen has extremely cold properties, when using 196°C liquid nitrogen to drip or soak in well-made food, it will keep the food at a rapid low temperature, maximizing the freshness of the food.

After the role of -196 ℃ liquid nitrogen, will allow the ice cream material in the mixing process to rapidly cool down, curing water molecules can not move in time, has formed a uniform distribution of fine ice crystals. In addition to the ice cream itself, this texture will be very smooth!

In addition, since many ice creams require the addition of coagulants or other food additives to keep the ice cream as we see it.

Liquid nitrogen at -196°C will directly solidify the ice cream, and require other food additives to achieve results, compared to liquid nitrogen ice cream is indeed very safe.

3: What are the hazards of using liquid nitrogen in food?

Above we have talked about the advantages and disadvantages of liquid nitrogen, it is very important that liquid nitrogen this special material can only be used to make dessert ingredients.

Although the liquid nitrogen for dessert type of food to play an absolute preservation of freshness, but in the liquid nitrogen evaporation, the food is eaten by us into the belly.

Since there is some liquid nitrogen left in the food or drink, this can cause damage to our skin and internal organs, and there have been reports that

Adding liquid nitrogen immediately before consumption can cause problems for those of us who inhale the vapors released by the liquid nitrogen, such as respiratory distress and frostbite!

Of course, in general, food treated with liquid nitrogen at the point of sale and before consumption will essentially evaporate by the time it reaches us.

Liquid nitrogen basically doesn't do any significant harm to us except to keep the food, at a very low temperature, but when we're spending a lot of money, it's just a show, and the food is no different than normal!

In conclusion:

Nowadays, it is rare to see this kind of liquid nitrogen ice cream on the streets, and when my friend was just making liquid nitrogen ice cream, it was all over the place.

The reason why it is now extinct is because the horror of liquid nitrogen at -196C has gradually been known to the public, and the gimmick of the businessman to make it up has not been able to attract the attention of the people.

This is the first time we've seen the liquid nitrogen in the world.