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what if the gas isn't in a container?

air pressure only works with a container.

do you posit that ordinary breathing air is in a container?

There can't be a vacuum next to air pressure as it would equalise.

so... yes?

It would dissipate into the vacuum

so ordinary breathing air must be in a container, right? is it?

Not sure what you mean - the air around us?

Yes - it hasn't all drifted into nothingness

Well the mainstream claim is that gravity holds the gases around the earth and from dissipating into what they call space. Not sure why you asked this.

It's pseudoscience because this claim cannot be verified and contradicts natural laws of physics, related to how gases behave when exposed to vacuum.

We clearly have ambient air, it hasn't floated away into nothingness, you reject the mainstream theory... what is your theory as to why the ambient air hasn't already all floated away?

Do you think "space" has the same sort of air at the same concentration?

Doubt it - I think it could be similar to a density gradient but for gases up to a point and after that some form of barrier to hold it all in. "Waters above" ... who knows.

What prevents the atmosphere to escape?

For one thing the absence of the vacuum, but who really knows.