|IUPAC name||Sulfur dioxide|
|Other names||Sulfurous anhydride
|Molar mass||64.066 g mol−1|
|Density||2.6288 kg m−3|
-72 °C, 201 K, -98 °F
−10 °C, 263 K, 14 °F
|Solubility in water||94 g dm−3|
|Vapor pressure||237.2 kPa|
|Viscosity||0.403 cP (at 0 °C)|
|Dipole moment||1.62 D|
|Std enthalpy of
|-296.81 kJ mol−1|
|248.223 J K−1 mol−1|
|S-phrases||, , , ,|
|Related sulfur oxides||Sulfur monoxide
|Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)|
Sulfur dioxide (also sulphur dioxide) is the chemical compound with the formula SO2. It is a gas. It smells like burnt matches. It also smells suffocating. Sulfur dioxide is produced by volcanoes and in various industrial processes. It is also used to protect wine from oxygen and bacteria. It can be produced by burning sulfur. It dissolves in water to produce sulfurous acid. It can be oxidized to sulfur trioxide, which is dissolved in sulfuric acid to make more sulfuric acid. It is used to make sulfites.
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A collection of estimates of past and future anthropogenic global sulphur dioxide emissions. The Cofala et al. estimates are for sensitivity studies on SO2 emission policies, CLE: Current Legislation, MFR: Maximum Feasible Reductions. RCPs (Representative Concentration Pathways) are used in CMIP5 simulations for latest (2013–2014) IPCC 5th assessment report.
Sulfur dioxide Facts for Kids. Kiddle Encyclopedia.