Bottle Oxygen

why can bottles of pure oxygen be stored in a bottle with the mouth up?

I suppose they can be, but you’ll lose all the oxygen. Can you say “effusion”?
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Wall mount Gas Cylinder Holder Oxygen, helium, etc. K-bottle and more $8.99

80 CF WELDING CYLINDER tank bottle for OXYGEN $187.87

20 CF welding cylinder tank bottle OXYGEN BRAND NEW $77.87

40 CF WELDING CYLINDER tank bottle FOR OXYGEN NEW $120.87

FULL 40 Cu Ft Oxygen Cylinder Tank Cga 540 Bottle $154.59

40 Cu Ft Oxygen Cylinder Tank Cutting Cga 540 Bottle $119.54

80 CF WELDING CYLINDER tank bottle for OXYGEN *NEW* $184.99

60 CF WELDING CYLINDER tank bottle for OXYGEN *NEW* $149.75

40 CF WELDING CYLINDER tank bottle for OXYGEN *NEW* $119.75

20 CF WELDING CYLINDER tank bottle for OXYGEN *NEW* $76.76