Why is it more difficult to breathe at very high altitudes compared to sea level, even though the percentage of oxygen in the air remains roughly the same?

8 views 2 helpful Updated Jul 27, 2026
Appears in Class 8th
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Answer

It is more difficult to breathe at high altitudes not because of a lack of oxygen percentage, but because the atmospheric pressure is significantly lower. Lower atmospheric pressure means there are fewer air molecules (including oxygen molecules) in a given volume of air, making the air "thinner." Consequently, with each breath, less oxygen is taken into the lungs, making it harder to get enough oxygen.

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