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A comment on Ask HN: Vacuum is so powerful, so why it doesn't suck the Earth's atmosphere?. Parent comment
More precisely: the force applied by the weight of the column of air above the semi-spheres.
Weight of the column of air -> air pressure -> force on semi-spheres.
As parent noted, high up in the atmosphere that is a small force. At sea level, ~1 kg/cm^2.
So: yes, it's gravity.
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More precisely: the force applied by the weight of the column of air above the semi-spheres.
Weight of the column of air -> air pressure -> force on semi-spheres.
As parent noted, high up in the atmosphere that is a small force. At sea level, ~1 kg/cm^2.
So: yes, it's gravity.