sulfur trioxide

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Related to Sulphur trioxide: sulphur dioxide

sul·fur tri·ox·ide

SO3; forms sulfuric acid, H2SO4, by its reaction with water.
Synonym(s): sulfuric oxide
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Sulphur Dioxide, Sulphur Trioxide (Sulphuric Anhydride), Diarsenic Trioxide, Nitrogen Oxides: European Union Market Outlook 2010 and Forecast till 2015
Firefighters were called after about 100kg of sulphur trioxide leaked from the site sending a vapour cloud into the air.