A-to-Z Guide to Thermodynamics,
Heat & Mass Transfer, and Fluids Engineering
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Sulfur Dioxide (SO2) is a colorless gas of a distinctive, strong odor. It is obtained from either pyrite or sulfur by burning. It is toxic and a strong irritant and is classified as one of the major air pollutants. It is widely used in the production of sulfur-containing chemicals, in the paper industry and in metal refining. It is also used as a solvent, as a food additive and as a reaction medium.

Molecular weight: 64.06Critical temperature:430.8 K
Melting point: 198.7 KCritical pressure:7.884 MPa
Boiling point:263.0 KCritical density:525 kg/m3
Normal vapor density:2.86 kg/m3(@0°C, 101.3 kPa)
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