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It could way less, it could way more, or it could way the same. Depends on the pressure. If the pressure is the same in both cubic meters, then the hydrogen ways less than the oxygen.
Gas is compressible. As long as you can keep increasing the pressure, you can stuff as much oxygen into a bottle or a tank as you want to, until it bursts.
Kilogram per cubic meter is the one that doesn't belong. Square meter is meter^2 and cubic meter is meter^3 but kilogram per cubic meter is a density
That doesn't make sense. Square meter is 2D. Cubic meter is 3D. To attempt to answer your question... A square meter is one meter long and one meter wide. A cubic meter is one meter long, one meter wide, and one meter tall.