Although it is far less dense, air is a fluid just like water. Thus, air is subject to the force of gravity (this is how it stays attached to Earth forming our atmosphere). The higher up one travels in elevation, the less air there is above pressing down, much the same way the water pressure decreases as one swims upwards in a pool.
Air pressure change depending on atmospheric mass, or the weight of the air above the measured point. So, higher elevations mean lower atmospheric mass, and consequently a decrease in pressure.
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