Senior Airman Charles Medley, 36th Logistics Readiness Squadron cryogenics production supervisor, takes a sample of the liquid oxygen to ensure purity Nov. 7, 2017, at Andersen Air Force Base, Guam. Liquid oxygen must have a purity of percent or higher to be used on aircraft. ( Air Force photo/ Airman 1st Class Gerald R. Willis)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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Keywords: cryogenics, liquid, oxygen