All planets, due to the presence of molecules with velocities, high escape velocities, lose their atmospheres. Why do atmospheres still exist?

The number of molecules with velocities greater than the escape velocities is continuously increasing as a result of intermolecular collisions. The planet must eventually lose its atmosphere. However, the scattering time during which this should happen is very long and comparable to the age of the planet for Venus, Earth, Jupiter, etc. For Mercury, on the contrary, the scattering time is very short because of the low escape velocity and high surface temperature. Therefore, by Mercury, its atmosphere has long been lost.

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