How much can an oxygen tank carry oxygen?
Depends on the size of the tank, and the temperature and
pressure of the gas. One common atmospheric temperature tank has an
internal volume of 1.2 cubic feet, and they are commonly delivered
at pressures of 2600 psi (or so). This gas source has a bit of
water in it too. Another common delivery method is as a liquid in a
dewar, and these are delivered by the unit weight, and they use
atmospheric heat to boil the liquid oxygen. This gas source is
usually very dry.