Pressure halves for every 5.5 km of altitude, which is why a breath on the summit of Everest holds only about a third of the molecules it would at sea level. From the ground up to 600 km there are five layers in sequence: past 12 km the clouds and weather end, 25 km is the ozone layer where temperature rises with height instead of falling, 80 km is where meteors burn up, and the ISS at 400 km is still inside the thermosphere rather than out in open space.
Pressure halves for every 5.5 km of altitude, which is why a breath on the summit of Everest holds only about a third of the molecules it would at sea level. From the ground up to 600 km there are five layers in sequence: past 12 km the clouds and weather end, 25 km is the ozone layer where temperature rises with height instead of falling, 80 km is where meteors burn up, and the ISS at 400 km is still inside the thermosphere rather than out in open space.
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