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Which mechanical phenomenon limits flow measurement using a capillary viscometer?

A)Deviation from Poiseuille's law
B)Increased fluid compressibility effects
C)Turbulent kinetic energy dissipation
D)Elevated boundary layer viscosity

💡 Explanation

Deviation from Poiseuille's law occurs because, at higher flow rates, inertial effects become significant relative to viscous forces; therefore the pressure drop is not linearly proportional to flow rate, rather than viscosity dominating at low speeds and idealized behaviour.

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