Air is subject to friction,which is why air flows slower at ground level than at altitude.

Name: Air is subject to friction,which is why air flows slower at ground level than at altitude.
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Air molecules at ground level have to overcome friction with objects on the surface, such as buildings and trees, which slows down their movement. At higher altitudes, there are fewer obstacles and less friction, allowing the air to flow more freely and at higher speeds.

Air Is Subject to Friction,which Is Why Air Flows Slower