This question already has an answer here:
If a sealed container that is 20 miles high is filled to a pressure of 50psi gauge pressure, will it have a pressure gradient the same as the Earth or does the fact that it is filled to more than atmospheric make a difference. Is not 50psi 50psi? Are the molecules not pushing in all directions inside the tank at 50psi? Does that then mean that the pressure of 50PSI at the top of the container is the same as the pressure at the bottom of the container also at 50PSI? 50psi being well in excess of atmospheric pressure.