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Liquid oxygen (LOX) is a pale blue, transparent, mobile liquid form of oxygen. It is obtained by compressing gaseous oxygen and is primarily used as an oxidizer in rocket propellants and in liquid-oxygen explosives (LOX).1

Oxygen itself is a nonmetallic chemical element essential for life, found as a colorless, odorless gas. It is the most abundant element in Earth's crust and makes up about 21% of the atmosphere. Oxygen readily forms compounds with other elements, a process often accompanied by heat and light, known as combustion.2

While oxygen gas is vital for respiration, its liquid form has industrial and specialized applications. Historically, LOX was used in explosives, particularly during World War I due to nitrate shortages, but its use has declined with the availability of other explosives. In medicine, oxygen therapy involves administering oxygen, which can be stored as a gas or a liquid.34

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