qOne way to measure how
soon the air runs out in the atmosphere is to
calculate the scale height, which is about 10 km.
qOver this vertical
distance, air pressure and density decrease by 37% of its
surface values.
qIf pressure at the
surface is 1 atmosphere, then it is 0.37 atmospheres at a
height of 10 km, 0.14 (0.37x0.37) at 20 km,
0.05 (0.37x0.37x0.37) at 30 km, and so on.
qDifferent atmospheric
gases have different values of scale height.