Reynolds Number Turbulence — FRCA Primary MCQ
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Correct answer: E — 2000
Re = (density × velocity × diameter) / viscosity. Laminar: Re < 2000 / transitional: 2000-4000 / fully turbulent: >4000. Clinically turbulence increases resistance and produces audible flow (stridor / murmurs). The standard teaching is that turbulent flow begins at Re > 2000.
Reference: Al-Shaikh Stacey 2019 Essentials of Anaesthetic Equipment