【How-to】What is p1 v1 p2 v2

The chemical symbol K comes from kalium, the Mediaeval Latin for potash, which may have derived from the arabic word qali, meaning alkali. Potassium is a soft, silvery-white metal, member of the alkali group of the periodic chart. … The chemistry of potassium is almost etirely that of the potassium ion, K⁺.