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**Molecular formula:** CO₂
**Molar mass:** 44,009 g/mol
**Information:** Carbon dioxide is a colourless gas that is odourless and tasteless. It is not toxic, but may cause asphyxiation. It is heavier than air and contributes to the greenhouse effect.
**Use:** Carbon dioxide is a chemical raw material for the production of a large number of inorganic and organic compounds. Solid carbon dioxide (dry ice) is used as a refrigerant. Liquid carbon dioxide is used for filling snow type fire extinguishers.
**Appearance:** Carbon dioxide is formed during respiration, fermentation and decay. It is the final product of the combustion of organic substances.