N2O4

N₂O₄, or dinitrogen tetroxide, is a chemical compound made of two nitrogen atoms and four oxygen atoms. It appears as a highly reactive, colorless, or pale yellow liquid at room temperature. N₂O₄ often exists in equilibrium with its gaseous form, nitrogen dioxide (NO₂), depending on temperature. It is commonly used in rocket propellants and industrial processes due to its strong oxidizing properties. When handled, it requires careful safety measures because it can be toxic and corrosive, and it easily decomposes or reacts with other substances.