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Related to boundary layer: Atmospheric boundary layer
The layer of reduced velocity in fluids, such as air and water, that is immediately adjacent to the surface of a solid past which the fluid is flowing.
(General Physics) the layer of fluid closest to the surface of a solid past which the fluid flows: it has a lower rate of flow than the bulk of the fluid because of its adhesion to the solid
the region of a fluid flowing in the immediate vicinity of a body, with the flow reduced by adhesion and viscosity.