you can probably return to that altitude without problems as long as you are properly acclimatized. The concentration of oxygen at sea level is about 21% and the barometric pressure averages 760 mmHg.

You may recall from high school science that atmospheric pressure decreases with increasing altitude. Planes typically cruise ...

For example, when one goes at high altitudes the atmospheric pressure decreases, which can lead to altitude sickness as the body struggles to obtain sufficient oxygen. In the similar fashion ...

Atmospheric pressure at sea level is about 101,000 Pa (101 kPa) but just 27,000 Pa (27 kPa) at the cruising altitude of a passenger plane. Air pressure is due to the weight of air in the ...