Management of compressed gas containers.

Bottom line

When the ambient temperature surrounding an oxygen cylinder decreases, pressure within that cylinder will decrease because pressure varies directly with temperature if the volume of a gas remains constant. A drop in indicated pressure on a supplemental oxygen cylinder can be an indication that the oxygen supply has merely compacted (not necessarily a leak). High-pressure oxygen containers should be marked with the psi tolerance (i.e., 1,800 psi) before filling the container to that pressure.