carbon dioxide

heavy colorless odorless gas which is released in animal respiration and the combustion of plant and animal matter (absorbed by plants in photosynthesis and used in making carbonated beverages)

Carbon dioxide is a chemical compound composed of two oxygen atoms covalently bonded to a single carbon atom. It is a gas at standard temperature and pressure and exists in Earth's atmosphere in this state. It is currently at a globally averaged concentration of approximately 375 ppm by volume in the Earth's atmosphere, although this varies both by location and time. Carbon dioxide's chemical formula is .
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chemical formula CO2, carbon dioxide is an asphyxiant with a TLV of 5,000ppm. Carbon dioxide is used in cleaning equipment and is a by product of photoresist stripping operations.

A colorless, odorless, non-poisonous gas that is a normal part of the ambient air. Carbon dioxide is a product of fossil fuel combustion. (DOE6)

A fluid consisting of more than 90 percent carbon dioxide molecules compressed to a supercritical state. (49CFR195)

A colorless, odorless, non-poisonous gas that is a normal part of the ambient air. Carbon dioxide is a product of fossil fuel combustion. Although carbon dioxide does not directly impair human health, it is a greenhouse gas that traps terrestrial (i.e., infrared) radiation and contributes to the potential for global warming. See global warming.