Sulfur dioxide（sulphur dioxide） is a colorless, pungent poisonous gas.

1. Sulfur dioxide is easy to liquefy (boiling point is -10℃),

Soluble in water (1∶40) at room temperature and pressure, 1 volume of water can dissolve about 40 volume of sulfur dioxide.

It's denser than air.

2. Sulfur dioxide（sulphur dioxide） is usually compressed into a liquid state and transported in cylinders.