Discussion
Assertion (A): Prandtl's boundary-layer hypothesis made practical aerodynamics possible.
Reason (R): It confines viscous effects to a thin layer, leaving the outer flow inviscid.
Select the correct answer from the options below.
Answer: A
Both statements are true and the second explains the first. Splitting the problem in two allowed potential-flow theory to be used where it works while viscosity was handled only where it matters. Before 1904 the two descriptions could not be reconciled, and d'Alembert's paradox stood unresolved.
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