Sodium oxide is a chemical compound with the formula Na2O. It is formed when sodium reacts with oxygen, typically during combustion. This white, solid substance is primarily used in the production of glass and ceramics, as it helps to lower the melting point of silica. In addition to its industrial applications, sodium oxide can also react with water to form sodium hydroxide, a strong base. This reaction is exothermic, meaning it releases heat. Sodium oxide is important in various chemical processes and serves as a precursor for other sodium compounds.