How to get high atmospheric pressure with 1g

I'm assuming that to hold onto more atmosphere, the planet would have to have more gravity, or the atmosphere itself would have to be comprised of denser gasses.

So, assuming that the planet has a mass similar to earth's and that the percentage of oxygen was close to that of earth's atmosphere (or higher), could a planet have an atmosphere dense enough for humans to swim through?

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How to get high atmospheric pressure with 1g

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