Liquid oxygen (commonly abbreviated LOX or LO2) is liquid oxygen. It has important applications in aerospace, submarines and gas industries.
Liquid oxygen is a light blue liquid with strong paramagnetic properties. Its main physical properties are as follows: usually the pressure (101.325 kPa) under density 1.141 g/cm³, solidification point 50.5 K ( -222.65°c), boiling point 90.188 K ( -182.96°c).
Liquid oxygen has a wide range of industrial and medical applications. The industrial process of producing liquid oxygen is to fractionation liquid air. The total expansion ratio of LOX is as high as 860:1, because it is widely used in industrial production and military in modern times.
Because of its low temperature characteristics, liquid oxygen can make its contact substances become very brittle. Lox is also a very strong oxidant: organic matter burns violently in liquid oxygen. Some substances that are immersed in liquid oxygen for prolonged periods may explode, including asphalt.
In the aerospace industry, LOX is an important oxidant that is usually used in combination with liquid hydrogen or kerosene (both as a reducing agent). Some of the earliest ballistic missiles used liquid oxygen as oxidants, such as V2 (LOX-alcohol) and R-7 (LOX-kerosene). In the case of propellant, liquid oxygen can provide a very high ratio of the engine; In addition, the other common propellant combination of dimethyl oxide-dimethyl hydrazide, liquid oxygen and several combinations of the form of clean environment (hydrazine-like substances are highly toxic).