pyrosulfuric acidpy·ro·sul·fu·ric acid
a strong, crystalline acid, HSO, prepared commercially as a heavy, oily, fuming liquid: used in making explosives and dyes, as a sulfating agent, etc.
Origin of pyrosulfuric acidpyro- + sulfuric
A fuming, dense, oily, colorless to dark brown liquid or hygroscopic crystalline solid, H2S2O7, 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.
- (inorganic chemistry) The acid, H2S2O7, formed by the reaction of sulfur trioxide with sulfuric acid; used in the manufacture of explosives etc.