Variation of pressure with height.

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The pressure decreases with increasing altitude. The pressure at any level in the atmosphere may be interpreted as the total weight of the air above a unit area at any elevation. At higher elevations there are fewer air molecules above a given surface than a similar surface at lower levels. Eg. There are fewer molecules above the 50km surface that are found above the 12km surface, which is why the pressure is less at 50km.

What this implies is that the atmospheric pressure decreases with increasing height. Since most of the atmosphere's molecules are held close to the earth's surface by the force of Gravity, air pressure decreases rapidly at first, then more slowly at higher levels.
Since more than half of the atmosphere's
molecules are located below an altitude of 5.5 km ,atmospheric pressure decreases roughly 50%(to around 500mb) with in the lowest 5.5 km.Above 5.5 km,the pressure continues to decrease but at an increasingly slower rate.