At high altitudes, such as on Mount Everest there is less air above you. This means that the density and pressure of air decreases as altitude increases. Each intake of air on Mount Everest has only one-third of the gas molecules-including oxygen-that would be present at sea level.
In the stratosphere, air pressure typically ranges from about 1000 millibars at the bottom to around 100 millibars at the top, which is approximately 50 kilometers (31 miles) above the Earth's surface. The pressure decreases with altitude due to the thinning of the atmosphere. As you ascend through the stratosphere, the air becomes less dense, resulting in lower pressure.
At high altitudes, such as on Mount Everest there is less air above you. This means that the density and pressure of air decreases as altitude increases. Each intake of air on Mount Everest has only one-third of the gas molecules-including oxygen-that would be present at sea level.
The air pressure at the top of Mount Everest is low pressure. At high altitudes, such as on Mount Everest there is less air above you. This means that the density and pressure of air decreases as altitude increases. Each intake of air on Mount Everest has only one-third of the gas molecules-including oxygen-that would be present at sea level.
The air pressure at the top of the stratosphere is very low, around 0.1 millibars, which is much lower than at the Earth's surface. It is where the Earth's atmosphere thins out and merges with space.
Because of the air pressure being low
The average air pressure in the exosphere is extremely low, near to a vacuum, typically less than 0.1 Pascal. At this altitude, the few particles present are very spread out, and there is an almost complete absence of molecules.
Air presure at sea level is 101.325 Kilopascals Air pressure on the top of Everst is 33.7 Kilopascals
None, there is air at the top of Everest and that air has just as much O2 in percentage terms (20%) as the air at sea level. The problem is that the pressure of the air at the top of Everest is much much less (4.89 psi) than the pressure of the air at sea level (15.48 psi). This means that in each breath you take there is less O2 in comparison to a lung full of air breathed in at sea level, you will need to take 3 breaths on the top of Everest to get as much O2 as one breath at sea level,
The air pressure is lowest at the highest altitudes, such as at the top of Mount Everest or in the upper layers of the atmosphere. This is because as altitude increases, there are fewer air molecules above exerting pressure downward.
The atmospheric pressure is caused by the weight of the air on top of us. At the top of mount Everest, there is less air above the exhausted climber (because a lot of the air is below). Less air, less weight, less pressure.
There is more atmospheric pressure in the Sahara Desert. The number of air molecules around us decrease as we go higher into the atmosphere, which also causes the air pressure to decrease. Since the Sahara Desert is closer to sea level than Mount Everest is, there are more air molecules and more pressure there.