Which layer of the atmosphere has the least amount of air pressure?

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The Exosphere
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Which atmospheric layer has the greatest air pressure?

It's the troposphere because : The troposphere contains 75 per cent of the atmosphere's gas. It also holds huge amounts of dust and water vapor, and is often dense with cloud

Why does the exosphere have the least amount of air pressure?

Air pressure decreases as altitude increases. Matter is held by gravity. The same reason that pressure is greatest in the core, the least pressure is farthest from the core. M
In Atmospheric Sciences

Why is there more air pressure in the first layer of atmosphere?

The atmosphere consists of 5 layers: the troposphere, which we live in; followed by stratosphere, mesosphere, thermosphere and exosphere. Air pressure at any of these layers i