At least 35 percent
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The exosphere is the outermost layer of Earth's atmosphere, where air is extremely thin. It contains a very small percentage of the total mass of the atmosphere, with most of the air present in the lower layers. The exosphere consists mainly of hydrogen and helium atoms.
The layer of the atmosphere with the least amount of air pressure is the exosphere, which is the outermost layer of Earth's atmosphere. It is composed of very thin air molecules spread far apart, resulting in extremely low air pressure.
The layer in the atmosphere that has the most air pressure is the troposphere, which is the lowest layer where most weather phenomena occur. As you go higher in the atmosphere, the air pressure decreases.
Air pressure is typically the least at high altitudes, such as at the peak of a mountain or in the upper atmosphere. This is because there is less air above exerting pressure downwards.
Air pressure is least at high altitudes, such as on top of mountains or in the upper atmosphere. As altitude increases, there are fewer air molecules above, leading to lower air pressure.
The exosphere is the upper layer of the atmosphere. The exosphere has a very low density, due to the lighter gases that are present in the exosphere. Hydrogen, with some helium, carbon dioxide, and atomic oxygen is found near the exobase. he exosphere is the last layer before outer space.