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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 of pyrosulfuric acid
1870-75 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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pyrosulfuric-acid in Science
pyrosulfuric acid
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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