when preparing for a climb, many climbers will measure the air pressure at the highest altitudes to which they will be climbing. why do they do this?

Answer: Because even at high altitudes there is still plenty of oxygen for breathing. However, pressure is what drives the oxygen into the blood stream. At lower pressure we aren't able to breath because the pressure is not high enough to get the O2 into the blood.

Explanation:

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PiaDeveau PiaDeveau · Answer 2 · 2021-09-29T10:45:56+02:00

While climbing to the highest peaks, climbers utilize bottled oxygen. They must take their time acclimating to the elevation because shifting from a higher to a lower pressure rapidly might induce decompression sickness.

There is also enough oxygen for respiration even at high elevations. Pressure, on the other hand, is what propels oxygen into the blood.

We can't breathe at lower pressures since the pressure isn't high enough to deliver oxygenated blood.

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