Difference between revisions of "Carbon dioxide"
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Revision as of 19:33, April 6, 2007
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). [1]
Each molecule of carbon dioxide has one carbon atom and two oxygen atoms, so its chemical formula is CO2.
- ↑ "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." How Stuff Works