Why the amount of oxygen decreases when we go up in the air
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Explanation:
Although the percentage of oxygen in inspired air is constant at different altitudes, the fall in atmospheric pressure at higher altitude decreases the partial pressure of inspired oxygen and hence the driving pressure for gas exchange in the lungs.
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Answer:
Because air is compressible, the air at the surface level is denser and compresses around us at the surface. However as you rise higher into the sky the air becomes less compressed and is therefore thinner in the upper portions of the atmosphere
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