Dry ice is the solid form of what substance?

Dry ice is the solid form of carbon dioxide. Carbon dioxide is a naturally occurring gas that is found in the Earth's atmosphere. Dry ice is produced by pressurizing and cooling carbon dioxide gas until it solidifies into a frozen state without going through a liquid phase. It gets its name "dry ice" because it does not melt into a liquid, but instead undergoes sublimation, where it directly converts from a solid to a gas at temperatures above -78.5 degrees Celsius. This unique characteristic makes dry ice a popular choice for various applications, such as refrigeration, transportation of perishable goods, and creating captivating fog effects due to the rapid evaporation when it comes into contact with warmer surfaces.