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Line 1: − + − At room temperature, it is a gas. + − It is exhaled when you breathe out. + − + +
-109.3 degrees Fahrenheit - dry ice
'''Carbon dioxide'''
'''Carbon dioxide''' is exhaled when you breathe out.
It is used by plants in the process of [[photosynthesis]] to generate [[oxygen]].
At room temperature, it is a gas. It becomes solid at extremely cold temperatures, forming [[dry ice]]. When it thaws, it turns directly into a gas again (see [[sublimation]]). <ref>"Dry ice is frozen carbon dioxide. A block of dry ice has a surface temperature of -109.3 degrees Fahrenheit (-78.5 degrees C). Dry ice also has the very nice feature of sublimation -- as it breaks down, it turns directly into carbon dioxide gas rather than a liquid." [http://www.howstuffworks.com/question264.htm How Stuff Works] </ref>
It is used by plants in the process of [[photosynthesis]] to generate [[oxygen]].
Each molecule of carbon dioxide has one carbon atom and two oxygen atoms, so its chemical formula is CO<sub>2</sub>.
Each molecule of carbon dioxide has one carbon atom and two oxygen atoms, so its chemical formula is CO<sub>2</sub>.
[[Category: Gasses]]
[[Category: Gasses]]