Sulfur dioxide (SO2) is 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)|