Alcohol, . . . . Never frozen. Mercury, . . . . -38.8deg.C. Sulphuric acid, . . -34.4 Ice, . . . . . 0. Sulphur, . . . . 115. Lead, . . . . 326 Zinc, . . . . 425 Silver (pure), . . . 1,000 Gold (pure), . . . 1,250 Iron (wrought), . . 1,600 The higher temperatures in this table are only approximate. Certain bodies soften and become plastic before they melt. In this condition glass is worked and iron is welded.