Potassium oxide, also known as POTASH, is a compound composed of one atom of potassium and one atom of oxygen. It is an alkali metal oxide with the chemical formula K2O and is used in a variety of industrial and agricultural applications. Potassium oxide is a white solid that is insoluble in water but soluble in acids. It is used in fertilizers, glassmaking, and as a flux in metallurgy. It is also used in the production of soaps and detergents.