sulphuric acid (H₂SO₄) Colourless, odourless liquid, one of the strongest acids known. It is produced by the oxidation of sulphur dioxide (SO₂). Sulphuric acid is a major industrial chemical, used in the manufacture of many acids, fertilizers, detergents, drugs and a wide range of chemicals. Properties: r.d. 1.84; m.p. 10.3°C (50.5°F); b.p. 330°C (626°F).

sulphuric acid (sul-fewr-ik) n. a powerful corrosive acid, widely used in industry. Swallowing the acid causes severe burning of the mouth and throat. The patient should drink large quantities of milk or water or white of egg; gastric lavage should not be delayed. Formula: H₂SO₄.