Sulphur trioxide

Definition of Sulphur trioxide

(Chem.) a white crystalline solid, SO3, obtained by oxidation of sulphur dioxide. It dissolves in water with a hissing noise and the production of heat, forming sulphuric acid, and is employed as a dehydrating agent. Called also sulphuric anhydride, and formerly sulphuric acid.

See also: Sulphur

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-Sulphur trioxide-
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sulphuric chloranhydride
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