liquid oxygen (O2)Oxygen in its liquid state, used as the oxidizer in many liquid-propellant rocket engines. Oxygen gas turns to liquid under standard atmospheric pressure at -183°C. Molecular weight: 32; density: 1.141 g/ml. Commonly referred to in rocketry as LOX. Related entries liquid hydrogen cryogenic propellant Related category PROPELLANTSAlso on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History |