Liquid oxygen is a pale blue, cryogenic liquid that is formed when oxygen gas is cooled to extremely low temperatures, below -183 degrees Celsius (-297 degrees Fahrenheit). It is used in various applications, including rocket propulsion, where it serves as an oxidizer to support combustion. In addition to its role in space exploration, liquid oxygen is also utilized in medical settings for patients with respiratory issues. It is stored in insulated containers to maintain its low temperature and is handled with care due to its highly reactive nature, especially when in contact with flammable materials.