Pyrosulfuric-acid definitions

pī'rō-sŭl-fyo͝or'ĭk
A fuming, dense, oily, colorless to dark brown liquid or hygroscopic crystalline solid, H2 S2 O7 , the primary constituent of oleum, produced by adding sulfur trioxide to concentrated sulfuric acid, and used in petroleum refining and in the manufacture of explosives.
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A strong, crystalline acid, H2S2O7, prepared commercially as a heavy, oily, fuming liquid: used in making explosives and dyes, as a sulfating agent, etc.
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A heavy, oily, colorless to dark brown liquid produced by adding sulfur trioxide to concentrated sulfuric acid. It is used in petroleum refining and the manufacture of explosives. Chemical formula: H2S2O7.
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(inorganic chemistry) The acid, H2S2O7, formed by the reaction of sulfur trioxide with sulfuric acid; used in the manufacture of explosives etc.
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