ANHY′DROUS

(-drŭs; an′hydrous , as marked by Brande, is le usual). Syn. An′hydrus , L.; Anhydré , Fr.; Was serf rei , Ger. Free from water; dry. In chemistry and mineralogy , a term frequently applied to substances, as acids, alcohol, gases, salts, minerals, ., which do not contain either free or combined water. Gases may generally be rendered anhydrous by pa ing them through a tube containing fused chloride of calcium, or ( e.g. AMMONIA and two or three others) quick-lime, in coarse powder; and some of them, by pa ing them through concentrated sulphuric acid. Salts may generally be dried by cautiously submitting them to the action of heat, or by exposure to a very dry atmosphere; and alcohol, and many other volatile fluids, by careful distillation from chloride of calcium, or some other highly hygrometric substance.