Answers: 2
, where p is the density, m is the mass and V is the volume and assuming that air density is 1.225 (Kg/m3) and knowing that exosphere is the upper atmosphere and its height is 10000 (Km). We now can get the volume as:
, so that the approximate mass of a column of air is: 
. Then the weight of this amount of air is:
, where W is the weight, m is the mass and g the gravity acceleration, so:
. Finally to find the pressure we know that gauge pressure equation 
where P is the pressure, p is the density of the column and h is the height of the column, so 
.
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