The oxygen content of air at any altitude is always about 21%
The air pressure decreases, meaning that the partial pressure of oxygen is also lower. By 16,000 feet (5000 m), there is only about one-half the pressure as at sea level.
The level of oxygen decreases on high mountains because it is slightly havier than air.
Plants produce oxygen by photosynthesis. The Earth's oxygen comes almost entirely from plant life. Of the plants supplying oxygen over haf are alagae in the Earth's oceans. As to why the oxygen level is maintained at about 21%, this is due to feedback loops in the oxygen cycle involving air and water temperaues, carbon dioxide availability, sunlight and ultraviolet light.
The lower the percentage of oxygen air contains, the more frequent a breath must be taken in order to maintain the blood oxygen level at an acceptable level.
It is at sea level. The higher you climb from sea level, to reach the summit of Mount Everest (for example), the less oxygen is in the very thin air. This is why the majority of climbers of Mount Everest have to carry oxygen cylinders. Someone occasionally achieves the summit without oxygen tanks! Therefore, the higher the altitude, the thinner the oxygen in the air.
21%
The air pressure decreases, meaning that the partial pressure of oxygen is also lower. By 16,000 feet (5000 m), there is only about one-half the pressure as at sea level.
21% of the air we inhale is oxygen
Atmospheric pressure is a measure of the amount of air pressing down on the earth. This would be highest at the surface of the earth. At 5000 meters, there are 5000 meters of air below you, so that is considerably less air.
The oxygen level remains about the same, but the density of the air is reduced.
2.66666666667 is the decimal of oxygen in the air
Oxygen is it's own element. Air is a combination of elements. That question is not even a sentence, but I think your answer is Air is 19% Oxygen at sea level.
The level of oxygen decreases on high mountains because it is slightly havier than air.
Sea level oxygen is around 21% and Denver has about 18% available oxygen.
Plants produce oxygen by photosynthesis. The Earth's oxygen comes almost entirely from plant life. Of the plants supplying oxygen over haf are alagae in the Earth's oceans. As to why the oxygen level is maintained at about 21%, this is due to feedback loops in the oxygen cycle involving air and water temperaues, carbon dioxide availability, sunlight and ultraviolet light.
I would say the air has the highest level of oxygen but it depends how high up you are.
If you are speaking in terms of blood oxygen saturation, then no, life is not sustainable at this level. Normal adult blood oxygen saturation is 96%-100% The air around us contains 21% oxygen at sea level. So speaking in terms of 63% oxygen in the air then survival would not be a problem as this would be triple the amount you currently breathe.