Encyclopedia
Potassium
A silvery-white metal (specific gravity 0.85), which can be cut with a regular knife. It is stored in mineral oil or in sealed ampoules.
Potassium is used in the manufacture of some photoelectric elements and in anti-friction alloys
Source: "Explanations to the Commodity Nomenclature of Foreign Economic Activity of the Russian Federation (HSN Russia)" (prepared by the Russian Customs Service) (volume 1, sections I - VI, groups 1 - 29)