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@Nym @Vsolid okay, this is just a really stupid talking point. I've heard it before, and it's just dumb. Pressure of any fluid whether it's a gas or a liquid is going to be the height of the gas multiplied by the density of the gas multiplied by local gravity. This isn't a suggestion, it's something that is used every single day around the world for fundamental measurements. That being the case, the idea that higher pressure can't exist under lower pressure is just wrong. Fundamentally wrong. There will always be higher pressure beneath lower pressure. It's the laws of physics. Your life right now fundamentally depends on that law of physics being correct. Eventually, you reach h = 0 when you're at the top of the column of fluid, and at h = 0 you multiply it out, the pressure due to pressure head is 0.

There are examples of gases being contained by gravity as well. Sulfur hexafluoride is heavier than oxygen. If you pour sulfur hexafluoride into a container with no lid, it will remain in that container. In fact, if you make a little paper boat, the paper boat will float on the sulfur hexafluoride. There's videos on YouTube that demonstrate this. In spite of the sulfur hexafluoride being in an open container, there will be higher pressure at the bottom of the container than at the top of the container, again because of the fundamental laws of physics.