why do we feel turbulence in an aircraft when going through clouds formed in the air, but not when walking through clouds formed at the surface?
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Turbulent drag is proportional to speed squared (as opposed to laminar drag which is proportional to speed). The faster you move, the more severe the turbulent force is.
Example. Hold your hand out while walking. The air resistance on your hand is pretty much negligible. Now if you stuck your hand out the window in a car while driving 60 mph, you will notice the air resistance on your hand to be much stronger.
Clouds create regions of high and low density air which creates the turbulence as you pass through it.
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