3. Liquid Oxygen
- Most people don't use liquid oxygen as a cryogen.
Since it tends to accumulate in other cryogens, it is possible to be handling it without knowing it.
It is therefore prudent to consider liquid oxygen to be present in all operations.
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- Keep dewars and equipment clean, especially from organic contamination.
Almost pure oxygen can condense in empty containers that are exposed to air and cooled by cryogens.
Some of the organic materials that can react violently with oxygen when ignited by a spark or even a mechanical shock are oil, grease, asphalt, kerosene, cloth, tar, and dirt that may contain oil or grease.
- Some materials may detonate if exposed to liquid oxygen and an ignition source.
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4. Liquid Hydrogen
- Hydrogen is highly flammable and it's use requires specialized training.
Since the use of liquid hydrogen is rare, it will not be covered here.
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