Credit: CREDIT NIAR/SCIENCE PHOTO LIBRARY

Caption: Filling up a medical oxygen tank outdoors. Oxygen is stored in its liquid state, at temperatures below -183 degrees Celsius, which causing billowing clouds of condensation around it.

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Keywords: air, billowing, cloud, cold, cryogenic, cryogenics, dangerous, fence, hospital, liquid, man, medical, outdoor, outdoors, outside, oxygen, storage, tank, therapy, working

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