Dry IceBy Eleanor Silverstein

Basic Facts

Dry ice is very cold: -109.3F or -78.5C. Dry ice melts into a gas, unlike regular ice. It skips the liquid state all together. Its so cold that touching it can cause frostbite or burns. Create the cool “fog” effect that you see in plays or on

Halloween.

What is dry ice and what is it made out of?

Dry ice is a solid carbon dioxide.

When it reaches its solid state, the cooled liquid carbon dioxide is put under pressure.

Why does dry ice smoke? At -109.3F the dry ice

subliminates from the solid state into the gaseous state

It undergoes deposition from a gas to a liquid.

Dry ice evaporates in the gaseous state as well as the solid state.

It evaporates into a liquid and then rises into the clouds and then it rains down.

Triple Point A fixed temperature/pressure at which the

three phases (liquid, solid, and gas) of that substance can coexist in equilibrium.

VOCAB!!! Sublimation- when a

compound transfers from the solid to gas state without going through the liquid state.

Deposition- when the particles settle down onto a pre-existing surface.

Sources: "How does dry ice work?." HowStuffWorks. Discovery Communications.

<http://www.howstuffworks.com/question264.htm>. "What is triple point?." Ask.com.

<http://in.answers.yahoo.com/question/index?qid=20090105021214AA3FgpW>.

http://chemistry.about.com/od/moleculescompounds/a/dryicefacts.htm