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sulfur dioxide (SO2)

A colorless, pungent, poisonous gas which dissolves in water to give a mixture of sulfuric and sulfurous acids. Sulfur dioxide is used in the contact process to manufacture sulfuric acid and as a refrigerant, bleaching agent, and preservative.

density (air = 1) 2.2
melting point -75.5°C (-103.9°F)
boiling point -10.0°C (14.8°F)

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