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Potassium   /pətˈæsiəm/   Listen
noun
Potassium  n.  (Chem.) An Alkali element, occurring abundantly but always combined, as in the chloride, sulphate, carbonate, or silicate, in the minerals sylvite, kainite, orthoclase, muscovite, etc. Atomic weight 39.0. Symbol K (Kalium). Note: It is reduced from the carbonate as a soft white metal, lighter than water, which oxidizes with the greatest readiness, and, to be preserved, must be kept under liquid hydrocarbons, as naphtha or kerosene. Its compounds are very important, being used in glass making, soap making, in fertilizers, and in many drugs and chemicals.
Potassium permanganate, the salt KMnO4, crystallizing in dark red prisms having a greenish surface color, and dissolving in water with a beautiful purple red color; used as an oxidizer and disinfectant. The name chameleon mineral is applied to this salt and also to potassium manganate.
Potassium bitartrate. See Cream of tartar, under Cream.






Collaborative International Dictionary of English 0.48








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"Potassium" Quotes from Famous Books



... hurried on. "I will just make a few scratches on this fourth sheet of paper - so. It leaves no mark. But it has the remarkable property of becoming red in vapour of sulpho-cyanide. Here is a long-necked flask of the gas, made by sulphuric acid acting on potassium sulphocyanide. Keep back, Dr. Waterworth, for it would be very dangerous for you to get even a whiff of this in your condition. Ah! See - the scratches I made on ...
— The Poisoned Pen • Arthur B. Reeve

... who dropped the sulphuric acid into the something of potassium? I nearly made a great ...
— Roden's Corner • Henry Seton Merriman

... especially valuable for the mineral salts they contain, chief among which are lime, phosphorus, sulphur, iron, potassium, and sodium. For this reason, the addition of eggs to any kind of diet supplies a large amount of the minerals that are needed for bone, blood, and tissue building. A favorable point concerning the minerals ...
— Woman's Institute Library of Cookery, Vol. 2 - Volume 2: Milk, Butter and Cheese; Eggs; Vegetables • Woman's Institute of Domestic Arts and Sciences

... galls with a gallon of water and strain; mix the liquors, and add immediately 10 oz. of copperas in coarse powder and 8 oz. of gum arabic; agitate until solution of these latter is effected, add a few drops of solution of potassium permanganate, strain through a piece of hair cloth, and after permitting to settle, bottle. The addition of a little extract of logwood will render the ink blacker when first written with. Half an ounce of sugar ...
— Scientific American, Volume XLIII., No. 25, December 18, 1880 • Various

... which were as much like one another as they were unlike the rest. Chlorine, iodine, bromine, and fluorine thus formed a very distinct group; sulphur and selenium another; boron and silicon another; potassium, sodium, and lithium another; and so on. In some cases, the atomic weights of such allied bodies were nearly the same, or could be arranged in series, with like differences between the several terms. In fact, the elements afforded ...
— The Advance of Science in the Last Half-Century • T.H. (Thomas Henry) Huxley


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