pyrosulfuric acid

pyrosulfuric acid

noun Chemistry.
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.
Also called fuming sulfuric acid, oleum.


Origin:
1870–75

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American Heritage
Science Dictionary
pyrosulfuric acid   (pī'rō-sŭl-fyr'ĭk)  Pronunciation Key 
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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