po·tas·si·um /pəˈtæsiəm/
 鉀[金屬元素]


 po·tas·si·um /pəˈtæsɪəm/ 名詞
 鉀


 Po·tas·si·um 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.

 ◄ ►


 potassium
      n : a light soft silver-white metallic element of the alkali
          metal group; oxidizes rapidly in air and reacts violently
          with water; is abundant in nature in combined forms
          occurring in sea water and in carnallite and kainite and
          sylvite [syn: K, atomic number 19]


 potassium
 Symbol: K
 Atomic number: 19
 Atomic weight: 39.0983
 Soft silvery metallic element belonging to group 1 of the periodic table
 (alkali metals). Occurs naturally in seawater and a many minerals. Highly
 reactive, chemically, it resembles sodium in its behavior and compounds.
 Discovered by Sir Humphry Davy in 1807.