- noun a strong acid that exists as a colourless oily corrosive liquid and is made by reacting sulfur trioxide with water. It is used in batteries and in the manufacture of fertilisers, explosives, detergents, dyes and many other chemicals.
- A colorless, dense, and strongly corrosive liquid whose chemical formula is H2SO4. It is the most widely produced chemical in the world, and is used, for instance, as an electrolyte in batteries, in electroplating, as an etchant, and in metallurgy.
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