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Which flow regime develops when a liquid's viscosity decreases substantially?

A)Laminar flow is more probable
B)Reynolds number increases rapidly
C)Viscous dissipation generates more heat
D)Pressure drop is always mitigated

💡 Explanation

Decreased viscosity lowers resistance to flow and increases the Reynolds number; because the Reynolds number is proportional to velocity and inversely proportional to viscosity, a rapid increase makes turbulent flow likely, therefore the flow transitions, rather than remaining stable or reducing pressure drop by definition.

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