The density of liquid carbon dioxide is 1.1 g/cm3. When pressurized and cooled, it can condense into solid carbon dioxide, commonly known as dry ice. The density of dry ice is 1.56 g/cm3. Dry ice is widely used.

1. Dry ice is used for artificial rainfall. Dry ice turns directly into a gas when it melts, absorbing heat as it melts, thereby lowering the surrounding temperature. Therefore, dry ice is often used as a refrigerant. Spraying dry ice high in the air with an airplane can condense water vapor in the air, thus forming artificial rainfall.

2. Dry ice is used for dry cleaning. Successfully removes oven baked-on residue, gums and oils. Effective cleaning of ovens, mixing equipment, conveyor belts, moldings, packaging equipment, hobs, hobs, containers, rollers, freezer walls, biscuit bars. It can clean electric boilers, condensers, and various heat exchangers; it can also directly clean indoor and outdoor transformers, insulators, power distribution cabinets, wires, and cables under load. Ink removal is difficult in the printing industry, and ink buildup on gears and guides can lead to poor print quality. Dry ice blasting removes a variety of oil-based and water-based inks and varnishes, and cleans oil, ink deposits and dyes from gears, guides and nozzles. Reduces downtime, eliminates the use of hazardous chemicals, discharges of hazardous waste and solutions, and personal injury from hazardous solvents.

3. Dry ice is used in the beauty industry. Some dermatologists use dry ice to treat pimples, a treatment known as cryotherapy. Because it will slightly freeze the skin. One freeze treatment for acne is a mixture of ground dry ice, ethyl ketone, and sometimes sulfur.

Liquid nitrogen and dry ice can also be used as materials for cryotherapy, which can reduce wound inflammation.

4. Dry ice is also used in the food industry. Add Dry ice cubes to wine, cocktails or beverages and drink cool and smoky, very pleasant. Add dry ice when making ice cream, the ice cream is not easy to melt, especially suitable for cold storage of takeaway ice cream. Seafood special dishes made by star hotels and restaurants, when served on the table, add dry ice, which can produce a white smoke landscape and improve the quality of the banquet. Lobster, crab, shark's fin and other seafood are frozen and refrigerated. Dry ice will not melt into water, and it is cleaner and cleaner than ice refrigeration.

5. Dry ice is used in the field of refrigerated transportation. Low-temperature refrigeration for medical purposes and low-temperature transportation of special drugs such as plasma and vaccines. Electronic low-temperature materials, long-distance transportation of precision components, etc. 

6. In the field of entertainment, dry ice is widely used in stage, theater, film and television, wedding, celebration, and some programs use dry ice to produce effects.