Dry ice cannot occur in the atmosphere, and what happens to dry ice when it is placed at atmospheric

d Liquefaction Dry ice has only gaseous solid two-phase in the atmosphere and therefore cannot be liquefied.

Running along a smooth surface, accompanied by white steam smoke.

Dry ice is actually solid carbon dioxide, which is condensed into a colorless liquid at a pressure of kilopascals, and then rapidly evaporated at low pressure to form dry ice. Dry ice is highly volatile and sublimated into a non-toxic, odorless, and gaseous carbon dioxide that is 600-800 times larger than that of a solid body. Therefore, dry ice should not be stored in a container with a fully sealed volume, nor should it be mixed with liquids, otherwise it is easy to occur**.

The uses of dry ice include: fire fighting, refrigerant, cleaning the dirt of industrial equipment, etc.

For fire extinguishing: Since dry ice is a solid form of carbon dioxide, it can be placed in a fire extinguisher to extinguish the fire through the flame retardant properties of carbon dioxide.

As a refrigerant: Because the temperature of dry ice is extremely low, usually reaching tens of degrees below zero, dry ice is often used in long-distance transportation and preservation.

Cleaning up dirt on industrial equipment: Dry ice is often used for cleaning large industrial machinery because of its extremely low temperature and its direct change to gas after use, which is not only convenient but also practical.

The gases emitted by dry ice are non-toxic. Dry ice is solid carbon dioxide, which will form some weak acids after sublimation in water: carbonic acid: carbonic acid, which will decompose into water and carbon dioxide when you drink it, and carbon dioxide is non-toxic.

The history of dry ice can be traced back to Faraday and Despie in England in 1823, who liquefied carbon dioxide for the first time, and then in 1834 the German Chiroel succeeded in producing solid carbon dioxide.

Carbon dioxide is not visible, in fact, it is not (carbon dioxide ulnar) smoke, it is (water) mist, carbon dioxide absorbs a lot of heat when it becomes a gas from a solid, so that the temperature of the surrounding air drops quickly, the air temperature drops, its solubility to water vapor becomes smaller, and the vapor wheel traps the gas to liquefaction reaction, releasing heat, and it becomes a small droplet, which is fog.

However, because carbon dioxide gas is often mixed with a lot of impurities, it needs to be purified by washing, desulfurization, drying, deodorization and other devices to remove impurities, and then compress this refined gas and cool it to make liquid dioxide silver carbon, which is solidified into snow, which is dry ice.

Dry ice has the ability to cool and sublimate by absorbing the surrounding heat, thereby taking the heat away from the surroundings and causing the surrounding temperature to drop, so dry ice works well as a coolant. Dry ice has a better cooling capacity than ice, so dry ice is more suitable for coolants transported over long distances.

Yes. According to the Economic **, the cooling effect of dry ice is more than double that of water ice, and when dry ice volatilizes, it will cause the surrounding temperature to drop sharply, and there is a potential risk of frostbite to the human body. Children, in particular, like to put dry ice on their hands or other parts to cool down or play, which can easily get frostbite**.

It is unlikely that the ice will be cracked and dismantled, but there is still a certain risk of improper storage. When dry ice volatilizes, it releases carbon dioxide gas that is more than 1,000 times larger than the volume of solid dry ice, and if it is placed in a confined environment, it will generate extreme pressure inside the storage environment, which will eventually lead to physical **.

Dry ice is a solid CO2 solidA small amount of inhalation is not harmful to the human body, but excessive inhalation will make people feel dizzy and so on, and if you exceed the amount, you will go directly to God, people still live on O2 It is made of liquid CO2 deep processing, CO2 is colorless, tasteless and non-toxic (breathing too much will suffocate). Carbon dioxide gas is usually mixed with various impurities, so it is necessary to remove impurities through other refining devices such as scrubbers, desulfur towers, drying towers, deodorization towers, etc., so that the purity of carbon dioxide can reach above.

This refined gas is then compressed, cooled to produce liquid carbon dioxide, which is sprayed from a nozzle into a dry ice-making tank, where a portion of it solidifies into snow. This snow-like substance is compressed to create dry ice. 4. Properties of Dry Ice 1) Cooling Capacity of Dry Ice Dry ice is sublimated by absorbing the heat around the storm.

The so-called sublimation is that the solid directly becomes a gas without going through the liquid state. The temperature does not change, and the heat required to change from a solid to a gas is called latent heat, and the heat required for sublimation is called sublimation heat. Snatching heat from the surroundings lowers the temperature of the surroundings, so the greater the latent heat, the greater the cooling capacity, and the better it is effective as a coolant.

The sublimation temperature of dry ice in the atmosphere is 137 calories per kilogram. However, the amount of heat required to rise from 0 to 0 is * (specific heat is. Heating up to 0 requires more heat than 16kcal, and the cooling power of cooling to 0 is equivalent to 153kcal per kilogram * 2) Comparison of Dry Ice and Ice The cooling capacity of dry ice and ice per kilogram of 0 is compared as follows: The cooling capacity of dry ice is 153kcal, and the cooling capacity of ice is 80kcal, which is twice that of ice.

Dry ice absorbs twice as much heat as ice. When compared with the specific gravity in solid form, the specific gravity of dry ice is, the specific gravity of ice is, and the specific gravity of dry ice is times that of ice. Therefore, if the cooling force of the same volume is compared, dry ice is theoretically about twice that of ice.

In fact, it is about 3 times) so it can be used as a refrigeration coolant for railway wagons, ships, cargo cars, etc., saving space, and the cooling effect that cannot be achieved by ice, eliminating the trouble of replacement, and is suitable for long-distance and long-distance transportation. 3) Properties of carbon dioxide gas Carbon dioxide gas is an inert and non-flammable gas, so it is very stable. Depending on the temperature and pressure, it can be divided into three states: liquid, solid and gaseous.

Liquid carbon dioxide is at least above the pressure in the absence of atmospheric pressure. At this pressure, liquid carbon dioxide can turn into solids and gases. The pressure is at the temperature of the liquefied carbon dioxide gas below zero.

At this time, temperature and pressure are called the "three key points". Carbon dioxide in this state can exist in liquids, gases, and solids at the same time. However, when the temperature is above it, it cannot become a liquid no matter how much pressure is compressed.

This temperature is called the critical temperature, and the pressure at this time (kg cm2) is called the critical pressure.

Dry ice is formed by the condensation of carbon dioxide. If we put carbon dioxide in a steel cylinder, put a certain amount of pressure, and lower the temperature, it will become a white solid, like snowflakes in winter, which is dry ice. The temperature of dry ice is very low, at Celsius.

Solid carbon dioxide is dry ice, dry ice can be sublimated at room temperature, sublimation to absorb heat, so that the temperature of the air is reduced, the water vapor in the air is liquefied when cold to form liquid water, no new substances are generated, it is a physical change

Answer: Solid carbon dioxide Water vapor Liquid water Physics.

Dry ice is solid carbon dioxide, which will quickly turn into carbon dioxide gas in the air, and the phenomenon of solid state becoming gaseous is called sublimation, and sublimation is the process of heat absorption; The water vapor in the clouds condenses into Xiaoice crystals or liquefies into small water droplets, and the falling process of Xiaoice crystals melts into water when heated, thus forming rainfall

So the answer is: sublimation; Suck; Sublimation; Liquefy; Melt

In summer, sprinkling water on the ground will feel cool, because water evaporates and absorbs heat It belongs to vaporization The principle of artificial rainfall is: the use of dry ice.

Sublimation absorbs heat, so that the air temperature is lowered, and the water vapor in the air.

Liquefaction in case of cold Therefore, the change of state of matter in dry ice is sublimation

The liquefied gas is stored in the gas tank by compressing the volume and increasing the pressure to liquefy the gas The blackening of both ends of the fluorescent tube is due to the tungsten vapor condensation of the water formed by the iron Hongyou cavity water cast into iron and magma.

Turning into rock is a phenomenon of solidification

So the answer is: vaporization; Sublimation; Liquefy; Sublimation; Congeal; Congeal;

Dry ice is said to be solid carbon dioxide at zero degrees, which can directly sublimate poison and taste, and carbon dioxide gas can be sublimated with extremely low temperature carbon dioxide gas, and when the air is warmed, it immediately forms a white dense fog and is beautiful.

Dry ice"Solid carbon dioxide is commonly known as obtainable.

In addition, compared with ordinary ice cubes (0), the specific cooling efficiency of ultra-low temperature is more characteristic and"Dry ice"The sublimation process produces any water in the same way"Dry ice"It has a bactericidal effect, which can effectively prevent the reproduction of food bacteria and maintain the freshness of food"Dry ice"It is widely used in fresh food, aquatic products, meat processing products preservation, storage and transportation and pharmaceutical industry, cold embedded metal low temperature treatment, etc.

Save dry ice. Dry ice must be stored in a special freezer, dry ice is preserved for 5-10 years, dry ice begins to freeze, and even vaporization.

Significantly reduce the amount of dry ice that must be removed from the machine at the end of each use and put it into the freezer.

Do not take dry ice directly by hand, the temperature of dry ice is very low, and direct contact between the body may cause frostbite of body tissues.

The storage and sealing performance and volume of dry ice are more volatile than the dry ice in the container, and the production is 1000 times that of the solid area, and the gas sealed container produces a huge pressure.

It doesn't make sense to ask such questions.

It is advisable to go down and check the information yourself.

What happens when dry ice is put in hot water? It's really shocking, so what is it?

When dry ice is exposed to room temperature, it will directly change from a solid state to a gaseous state, a phenomenon called (sublimation).

The use of dry ice (placement) on the stage produces a faint white fog due to dry ice (sublimation and heat absorption), which lowers the temperature of the surrounding air, and the water vapor in the air is formed when it is cold (condensed) (small droplets).