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Reynolds' Theorem
Reynolds' work on flow indicates that there are two types of flow:
(a) laminar flow
(b) turbulent flow

In the laminar flow, molecules flow in even and regular patterns. In the turbulent flow the movement of the molecules is rapid, random and not streamlined; this type of flow creates return movements and eddies. Activity in water can be made more difficult by changing from a streamlined movement to an unstreamlined movement. For some disabled persons the inability to change the body shape may mean that work is taking place in the more difficult upstream circumstance. Reynolds' work leads into the theory of the boundary layer.
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