atmospheric pressure decreasing with altitude

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atmospheric pressure decreasing with altitude
Hi!

I have a question that I really would appreciate your thoughts on. Not being an expert in any way here so bare with me.

The atmosperic pressure is decreasing when the higher we are above the sea level. I think it is well documented that the air pressure is much less at the top of Mount Everest compared to the sea level for example. And that is also what Google will tell us.  

In other words, when the distance between the atoms in the air are further apart the air pressure is lower …