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First, I can't talk about ChatGPT because I don't care what it says and I'm sure it says all kind of nonsense all the time. It's answers are composed word by word based on likelyhood and when there isn't enough source material it starts to get wonky.

But, you said it yourself, there isn't a perfect vacuum. I'm not an expert so I can't give you the answer but atmosphere rarifies over a very large area. Your room can only capture a very tiny potion of that, and it will be for all intents and purposes, homogeneous in gas density.

Your vacuum chamber in the room is also redundant, because I think you're asking, in a way, why doesn't gravity pull down all the molecules to the floor, eventually? That is where I don't really know why, but if I were to guess, I would say that they have a lot of energy that keeps them traveling and bouncing around. Maybe they bounce off the floor and then back up, and there is little to no resistance to them traveling, as there is no friction from collisions with other molecules. When you open up your vacuum chamber they will just bounce in there, too.

Why atmosphere is denser near the ground is because there are way more molecules and they bounce much more often and don't get to travel quite far. The mass of all molecules above keeps them down and the effect is cumulative over a very long distance, to space.

Maybe you're thinking about water, why doesn't water just go up in the air? I think that is because of the density. Water molecules are touching nearly at all times because they are heavy, while air molecules (like O2, N, and other gases) aren't as heavy and bounce off each other. There is probably some threshold that is a limit between gravitational acceleration and molecule/atom weight. Maybe on a planet with higher gravity you'd see air liquefy or something like that.

Anyway, ChatGPT ain't your answer, and I'm actually glad because that means it won't take all our jobs.

Gravity can either have an effect on gases and prevent them from escaping into a vacuum or not. It's that simple. There is no experiment that you could ever do that can prove that gravity will prevent gases from expanding into a vacuum.

Stop crying about how flat earthers can't understand and explain how it's possible?

Lying about everything is a poor reason. If they lie about everything, how come you're sitting at a computer right now, a box using tiny invisible electron gates inside a tiny silicon chip, made by all the science we have available to us today.

All that knowledge and science, which enables you to see and read this text that resides inside another tiny box at the other side of the world.

You can't cherry pick what they "lie about" to fit your agenda if you're content on using the technology of "the liers" to tell us "they lie about everything".

If they lie about everything, you need to flush your computer down the toilet, because that should be a lie too. Same goes with electricity. Stop using it.

You can't have it both ways. You need stop trying to drag others into your delusion. Everything you say is a contradiction, and proves you're either doing in intentionally, or you are extremely stupid.

Do you mean Occam's razor?

You have got to be a troll. I can't imagine anyone so intentionally stupid.

Gravity doesn't stop gases escaping. Gravity just helps settle different densities of things. Space weighs less than air so it floats on top of the upper atmosphere.

Gravity isn't a hard concept, but a bunch of wankers make a living making it confusing.

Gases are just molecules bouncing around. Light gases get bumped by heavier ones so they can achieve escape velocity. This is why the only source of helium is underground radioactive decay.

It's very cold the edge of the atmosphere. speed of gas molecules when they escape to space.

Also Gay-Lussac's law, "The pressure exerted by a given mass and constant volume of an ideal gas on the sides of its container is directly proportional to its absolute temperature." At a low temperature, the pressure would be very low.

Your room with room-temperature gas is moving much faster than the gas at the edge of the atmosphere.

Gravity at the edge of the atmosphere is effectively the same. It is technically weaker but the difference is nothing like earth and the moon.

russia operates huge troll networks which obviously target right wing sites, pretty sure they're all mindlessly pro-russia. it starts to tell when you prove them wrong and show unequivocally that russia isn't on our side yet they just keep repeating the same crap over and over the next day regardless.