|Formula weight||64.1 amu|
|Melting point||198 K (-75 °C)|
|Boiling point||263 K (-10 °C)|
|Solubility||9.4 g in 100g water|
|Ingestion||Relatively low toxicity, may cause nausea and vomiting. Long term hazards known.|
|Skin||Hazardous when cryogenic or compressed.|
|Eyes||Hazardous when cryogenic or compressed.|
|More info||Hazardous Chemical Database|
It is produced by volcanoes and in various industrial processes. In particular, poor-quality coal and petroleum contains sulfur compounds, and generates sulfur dioxide when burned: the gas reacts with water and atmospheric oxygen to form sulfuric acid (H2SO4) - and thus Acid rain.
Sulfur dioxide is frequently used as a food additive: particularly as a preservative in alcoholic drinks.