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potassium vs. potassium chloride

[ puh-tas-ee-uhm ]
  1. a silvery-white metallic element that oxidizes rapidly in the air and whose compounds are used as fertilizer and in special hard glasses. Symbol: K; atomic weight: 39.102; atomic number: 19; specific gravity: 0.86 at 20°C.
  1. a white or colorless, crystalline, water-soluble solid, KCl, used chiefly in the manufacture of fertilizers and mineral water, and as a source of other potassium compounds.

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