Purity refers to a polymer composed of simple substances or compounds, which has a fixed composition and fixed physical and chemical properties. The composition of dry ice is only solid carbon dioxide, so it is pure.

The temperature of dry ice is much lower than that of water, so it is equivalent to heating dry ice, which absorbs heat and sublimates, reducing the temperature of water and even freezing it. Dry ice is solid carbon dioxide, which is condensed into colorless liquid under the pressure of 6250.5498 kPa, and then rapidly solidified under low pressure.

The history of dry ice can be traced back to 1823 Faraday and Derby in England. They liquefied carbon dioxide for the first time, and then Chirolet of Germany successfully produced solid carbon dioxide at 1834.

Use of dry ice

(1) Fire fighting field: dry ice is used for fire fighting, such as some low-temperature fire extinguishers, but its application in this field is less and its market sales level is low.

(2) Refrigeration and transportation field: dry ice is used for cryogenic medical purposes and low-temperature transportation of special drugs such as plasma and vaccines; Long-distance and short-distance transportation of electronic cryogenic materials and precision parts; High-grade food preservation transportation, such as high-grade beef and mutton.

(3) Entertainment field: Dry ice is widely used in making clouds on stage, theater, movies, weddings, celebrations, parties, etc. There are countless special effects classic plays made of dry ice in China and even in the world. This is one of the most common areas.

Reference to the above content: Baidu Encyclopedia-Dry Ice