The Probert Encyclopaedia of Science & Technology

SULPHUR DIOXIDE

Sulphur dioxide is a sulphurous anhydride gas that is given off from some volcanoes and is produced whenever sulphur or its compounds are burned in air. It is a colourless gas with a very sharp, suffocating smell. It is very soluble in water forming an acid, which in the atmosphere is known as acid rain. It is a powerful antiseptic and is used to remove traces of chlorine from bleached material, and in the curing of hops.
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