3 ms·
On mobile so I'll let other ppl sezrch. My $0.02: atmos pressure is a resultant of gravity, which is a result of mass. The mass has reduced over time, due to s
by ArnoVW 4y ago
On mobile so I'll let other ppl sezrch. My $0.02: atmos pressure is a resultant of gravity, which is a result of mass.
The mass has reduced over time, due to solar wind blowing away our atmosphere. But compared with the mass of the friggin' earth, my intuition says atmos pressure has reduced only slightly
- ben_w 4y agoI see where you're going with that, but gravitational force is GMm/r^2, so the mass of the air column halving would halve the pressure, and the shell theorem implies that is exactly half and not even a rounding error on M because none of the air above (the only bit contributing to the pressure) can contribute to the gravity field. First part is also why Venus, with a lower mass, is able to have about x89 Earth's atmospheric pressure.