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Atmospheric pressure varies due to elevation (altitude) and because of the motion of air masses over the surface.

For altitude differences, the pressure is the result of the surrounding air. Higher pressure is experienced at lower altitudes just as higher pressure is found in greater depths within a body of water. A simple explanation is that the "column of air" above a surface "pushing down" is much shorter if you move higher into the "sea of air." This lower weight is expressed as lower pressure, which represents fewer molecules within a given volume of air.

The higher the altitude (eg. mountains) = The lesser the atmospheric pressure

The lower the altitude (eg. sea level) = The higher the atmospheric pressure

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