Question:
Reynolds number is defined as the ratio of:
Reynolds number is defined as the ratio of:
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Reynolds number distinguishes laminar and turbulent flow: $Re < 2000$ (laminar), $Re > 4000$ (turbulent).
Updated On: Jan 17, 2026
- Viscous force to Inertia force
- Elastic force to Pressure force
- Inertia force to Viscous force
- Gravity force to Inertia force
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The Correct Option is C
Solution and Explanation
Step 1: Recall definition of Reynolds number.
Reynolds number is:
\[
Re = \frac{\rho V L}{\mu} = \frac{\text{Inertia force}}{\text{Viscous force}}.
\]
Step 2: Check options.
- (1) Viscous/Inertia = Wrong (inverse of Reynolds).
- (2) Elastic/Pressure = Related to Mach number, not Reynolds.
- (3) Inertia/Viscous = Correct definition.
- (4) Gravity/Inertia = Related to Froude number, not Reynolds.
Step 3: Conclusion.
Hence, Reynolds number is the ratio of inertia force to viscous force.
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