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← ScienceWhich fluid instability occurs when a Reynolds number threshold is exceeded in a pipe?
A)Laminar flow transitions to turbulence✓
B)Surface tension drastically increases
C)Viscosity approaches zero asymptotically
D)Molecular diffusion accelerates exponentially
💡 Explanation
When the Reynolds number exceeds its critical value within a pipe, inertial forces dominate, triggering a transition via shear-induced instabilities resulting in turbulence; therefore laminar flow ceases, rather than viscosity changing because Reynolds number is high.
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