Physical Property

　　 Density and state: 2.551g/l, gas (standard condition)

Solubility: 9.4g/ml (25 ℃)

Color state: colorless at room temperature

Melting point: - 72.4 ℃ (200.75k)

Boiling point: - 10 ℃ (263K)

Chemical property

Sulfur dioxide can be formed when sulfur is burned

　　 S（s）+O2（g）→SO2（g）

　 　Hydrogen sulfide can be burned to produce sulfur dioxide

　　 2H2S（g）+3O2（g）→2H2O（g）+2SO2（g）

　　 Sulfur dioxide can be produced by heating pyrite, sphalerite and mercuric sulfide

　　 4FeS2（s）+11O2（g）→2Fe2O3（s）+8SO2（g）

　　 2ZnS（s）+3O2（g）→2ZnO（s）+2SO2（g）

　　 HgS（s）+O2（g）→Hg（g）+SO2（g）