What Is Dry Ice?
dry_ice_block.jpg
dry ice block and protective gloves

By: Kristin DLast Date Updated: 9/28/11

Carbon Dioxide

Dry ice is solid carbon dioxide. Humans breathe out carbon dioxide and carbon dioxide is used in fire extinguishers. Carbon dioxide is made up of 1 carbon and 2 oxygen atoms.

How dry ice is made and how it works

There are two ways to make dry ice. Go from gas to liquid to solid or go from gas to solid. Once it is in the dry ice phase it does not go back.The process of going from gas to solid is called crystallization and from solid to gas is sublimation. Dry Ice becomes a gas at -78.5°C.Dry ice is frozen in 45 pound blocks.

Carbon Dioxide particles VS Water particles

Water particles want to be together so that is why they evaporate so slowly. On the other hand carbon dioxide particles don’t want to be together so they go from solid to gas if they get hot enough. Solid particles are squished together and vibrate. Liquid particles are linked together and they spin. Gas particles are not connected at all and bounce all around. So waters liquid particles want to stay together and they will until it gets too hot. Carbon dioxides particles don’t want to be together so if it gets hot they will break apart very fast. Sometimes like in dry ices case particles will skip liquid phase all together!




KristinD574_how_you_make_dry_ice.jpg
Two ways dry ice is formed and deformed



Uses of dry ice



Dry ice is usually used for storing meat, ice cream or medicine. It also may be used on stage for a light

fog.

dry_ice_block_kristin.jpg
multiple dry ice blocks


Dangers of dry ice

Since you breathe out carbon dioxide gas you do not want to breathe it in again so one danger of dry ice is don’t put yourself and it in a confined space.

dry_ice_dangers_example.JPG
dangers of dry ice diagram

Another danger of dry ice is, since dry ice is so much colder than real ice you could burn or get frost bite by touching it!

Glossary

Sublimation- the process of going from solid to gas and skipping the liquid phase

Crystallization- the process of going from gas to solid and skipping the liquid phase

Solid- particles that are packed together and vibrating

Liquid- particles that are together but moving

Gas- particles that are not together and are bouncing around

Citations

Condensation, Freezing, and Sublimation. Prod. Brian Jerome. Brian Jerome, 1998. Discovery Education. Web. 12 September 2011.

Draper,Steve. Sept 12 2011

"dry ice." Encyclopædia Britannica. Encyclopædia Britannica Online School Edition.

Encyclopædia Britannica, Inc., 2011. Web. 13 Sept. 2011.

Evaporation, Transpiration, and Sublimation. Prod. Alan Sealls. Alan Sealls, 2004. Discovery Education. Web. 12 September 2011.

Knight, Judson. Science of Everyday Things; Real Life Chemistry. Detroit: Gale Group,2002.Print

"soft drink." Compton's by Britannica. Encyclopædia Britannica Online School Edition.

Encyclopædia Britannica, Inc., 2011. Web. 12 Sept. 2011.