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pyrosulfuric acid

noun

, Chemistry.
  1. an oily, hygroscopic, corrosive liquid, H 2 S 2 O 7 , that, depending on purity, is colorless or dark brown: used chiefly as a dehydrating agent in the manufacture of explosives and as a sulfating or sulfonating agent in the manufacture of dyes.


pyrosulfuric acid

/ pī′rō-sŭl-fyrĭk /

  1. 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: H 2 S 2 O 7 .


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Word History and Origins

Origin of pyrosulfuric acid1

First recorded in 1870–75

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pyrosulfuricpyrosulphate