Standing at the top of a tall mountain,a breath of air would contain a lot fewer molecules than a breath of air taken at sea level,but the proportion of oxygen in the two breaths of air,relative to the other constituents,would remain the same.

Question

Quizplus · Accepted Answer

The proportion of oxygen in the air remains the same at different altitudes, although the overall density decreases. This is because the composition of air is relatively constant up to a certain height in the atmosphere.

Standing at the Top of a Tall Mountain,a Breath of Air