Discussion
Which direction does pressure change as one climbs a mountain?
Answer: C
Pressure falls with height because less air remains above, and the rate of fall is governed by the density of the air at each level through the hydrostatic equation. The decrease is approximately exponential rather than linear, so it is more rapid near the surface where the air is densest. Climbers experience the effect directly through reduced oxygen availability, since the partial pressure of oxygen falls in exactly the same proportion as the total pressure.
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