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← ScienceWhich risk increases when viscous fluid undergoes cooling?
A)Poiseuille number decreases considerably
B)Kinematic viscosity greatly increases✓
C)Laminar flow becomes more stable
D)Fluid density reduces unexpectedly
💡 Explanation
Cooling increases molecular attraction causing an increase in internal friction; therefore viscosity increases via **momentum diffusion**. This results in a greater increase in kinematic viscosity because density only changes fractionally, rather than dropping catastrophically.
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